Ultimately, it’s important to remember that BlueSky is a for-profit business, like Twitter, like reddit. I urge everyone to avoid it where possible, just like I would go back in time and urge people not to make Twitter a thing.
They will inevitably go down a similar path. Even in the best case hypothetical scenario, they are still beholden to the interests of shareholders and advertisers. They have to make money from you, or from rich companies, to survive. Mastodon instances, on the other hand, are scalable enough that they can sustain themselves off self-funding or donations. Just like Lemmy, they don’t have an intrinsic motivation to throw in ads, or to get you addicted to scrolling and arguing, or to censor communities that offend their sponsors.
It’s no co-incidence that you’re feeling some similarities between Lemmy and Mastodon, in fact Mastodon users can actually post here! ‘Fediverse’ programs all use the same language (protocol) to communicate and so some are able to interact. I’ve had a Lemmy<->Mastodon conversation before. Admittedly it’s not ideal to do that everyday, because of the obvious difference in formats, but having the ability to do that can be useful, especially if one service has a community that yours doesn’t.