God damn, have you tried looking for crap that is not just the front page of YouTube not signed in? There are endless streams of amazing content that is incredibly educational or hilarious or mind blowing if you know where to look. People making new music of all different genres with insane levels of skill, people literally sharing PhD level knowledge for free. There are plenty of valid criticisms of YouTube as a platform, and there is certainly some crap content out there, but don't throw the baby out with the bathwater. There are tons of incredibly talented and inspired content creators out there on the platform.
I really agree. I want to like Lemmy, I really do, but every post is doom filled negativity. It's like a big negativity circlejerk where people are only ever posting about stuff they hate, like Elon and Twitter/X and Chrome and capitalism. There is very little content that actually celebrates something. Perhaps this is the issue with social media in general, as that has been the vibe I've gotten from Twitter and why I've never really been much of a user of it. There is definitely a similar thing on Reddit but Reddit is large enough that you can find pockets (usually smaller niche communities) that are more filled with positivity. But maybe Lemmy doesn't have enough of a critical mass to foster those sorts of communities yet.