Update 21/09/2024: #4734 (comment) EDIT by @unixfox: The Invidious team is aware of this issue. It appears that it affects all the software using YouTube. Please refrain from commenting if you have...
EDIT: For those who are too lazy to click the link, this is what it says
Hello,
Sad news for everyone. YouTube/Google has patched the latest workaround that we had in order to restore the video playback functionality.
Right now we have no other solutions/fixes. You may be able to get Invidious working on residential IP addresses (like at home) but on datacenter IP addresses Invidious won't work anymore.
This is not the death of this project. We will still try to find new solutions, but this might take time, months probably.
I have updated the public instance list in order to reflect on the working public instances: https://instances.invidious.io. Please don't abuse them since the number is really low.
Feel free to discuss this politely on Matrix or IRC.
And in the modern era there's generally no practical reason to use "u" for "you" and so forth anymore, and doing so just makes you seem weirdly lazy, elderly, childish, and really out of touch all at once.