What can an individual do to fight against tech billionaires?

Call Luigi?

Who are those two in the picture? Are we supposed to know them?
- that's edited photo, original is just as derpy. it's altman and nadella
  btw this is very much a "heartwarming - the worst people you know are fighting" sitution

all individual can do is find other individuals and try to do something together

Yes totally, but I still kind of expected tries.

Instead of spending 200$ a month on subscriptions, spend 300$ on a used PC, take a weekend to learn how to selfhost/pirate and then pay 5$ for a trustworthy vpn like mullvad. If you're in the EU, send data deletion requests to every big company you've had an account with. Start buying things off local retailers, not Amazon. Buy computers/phones either second hand or from smaller/more trustworthy manufacturers...
And most importantly. NEVER. STOP. COMPLAINING. ABOUT. IT. The moment the complaints stop is the moment that bullshit is accepted...
- Not sure if this is really accessible for everyone.
  It's probably easy to underestimate how difficult setting up and managing services can be.
  
  You don't need to do everything I mentioned, doing one of those things is more than enough... You don't need to self host, I know it's hard, I'm just putting it out there as an option :>

An individual can do very little.
Which is why we organize, strike, and practice solidarity, together.
If you want to help, look for left movements in your area. Food Not Bombs for example.
- Find out what National union would support your profession and go help them out.

Learn what it is that makes a cybertruck rust...
- The rain?
  
  Commencing rain dance!

Fight for regulation
The only thing that can stop them from their established position of power and influence is regulation that limits those, with effective checks and prosecution.
Split up their platforms and companies, require transparency and provable decency, require structural or behavioral changes
They have so much money, fines won't do a thing [unless they're excessively high and against their companies]. They have such established prevalence with their platforms, activism of and with evasion won't have much of an impact at scale.
Demonstrating public aversion towards advertisers is also a workable approach that could have an impact [long term].

Pirate, AdBlock/Sponsorblock and use Free/Open Source alternatives.

Years ago people laughed at me for not having Facebook (and never having had it in the first place). Who's laughing now? Not me, nor any other consumers. But hey, we tried...

Shoot them
- Pull a Luigi
- I'm not condoning violence but I'm kind of surprised no one have yet taken an RPG shot at elons jet or something. Even blowing it up empty would send a message I guess.
  I mean someone actually shot at drump so it can't be that complicated.
  
  I mean someone actually shot at drump so it can’t be that complicated.
  Firstly it wasn't an RPG. I don't think you realize how complicated it is to get your hands on a functional RPG. Not to mention, if you want to blow up Musk's aircraft, you probably want a portable surface-to-air missile like a Stinger. Good luck getting one of those too.
  Secondly the dude missed Trump, so it is a bit complicated. You need some sniper skills he obviously didn't have, and a lot of preparation - and probably a good dose of luck - to set yourself up for a shot and not get caught.
  Thirdly, the dude was wasted. So anybody thinking about fixing America's problems that way should feel ready to lay down his life for the cause. People usually talk the talk but rarely walk that kind of walk.

The first thing you can do is not buy anything that makes the tech billionaires more money. All they care about is money: don't give them any if you can help it.
- for example:
  get off of facebook (easy). don't buy tesla or use starlink (easy). don't buy on amazon (difficult but doable). Don't upgrade your iphone, and don't buy new apple products (moderate). Don't use CHATGPT (easy).
  
  Use Linux and open source software. Contribute to open source projects. Buy hardware second hand. Use non corporate social media. Buy local. Get your stuff fixed instead of throwing it away. Avoid data harvesting where possible.
  
  Getting off Amazon was easier than I thought. Has been years now, and I only needed to order through a friend once, when I needed a specialty item I could find nowhere else. Most small shops have comfortable checkout systems now and short delivery times. And there's eBay, which afaik takes a smaller cut from third parties than Amazon.
  
  I'd add not using Amazon Prime, Amazon Web Services and other Amazon services. Not using X, being critical of SpaceX. Also, stop advertising these things, stop telling your friends about them, maybe even stop talking about them altogether. I think for some strange reason sometimes bad press is better than no press.
  
  or use starlink I don't know if I'd call that easy for some people in very remote areas. Easy for me, easy for you, but not necessarily easy in some cases. Here's hoping a good competitor can get to those places.
- But it will make me mildly uncomfortable! /s

You start by 3D printing a gun.

organize with others.