There's nothing wrong with using Reddit, Twitter, and other mainstream site still while being active on fediverse.
I see a lot of posts on fediverse trashing reddit, Twitter, spez, musk and so on, and rightfully so. But like it or not, the mass majority of users on the internet still use these sites, and some of us still want to interact with the friends and communities we are a part of on those sites. And there's nothing wrong with that either.
Personally, I want fediverse to grow, and I post on kbin and mastodon constantly, and try to grow the communities on them. But I still pop over to reddit for r/splatoon, r/casualconveration, and my hometown sub, because either the communities haven't grown enough here yet for constant fresh content, or the content is different enough between both to justify me checking in.
I get many are here as a protest against reddit, Twitter, or where ever else you came from, and that's valid. But there are many of us who are simply casual users who want to include fediverse into their drives of other social media, and that's totally fine too.
My personal stance is to use Lemmy for everyday browsing and scrolling, but if google searching for something like product reviews, tech support etc end up taking me to reddit, then that's ok. I don't agree with Twitter either, but sometimes you get linked to a tweet or something. Reddit is now for incidental, research purposes only. Going from a everyday reddit user to 'only when google takes me there' user is still quite the downgrade in my eyes and I feel like I'm not really supporting them anymore and no longer a 'customer' of theirs.