BlueSky is really just Twitter pretending to be Mastodon, but that's a minor issue compared to the problems associated with platforms like "X" and TikTok today.
What matters most right now is killing off Twitter and breaking up the dominance of any one platform on social media. I really don't care where people go as long as they get the fuck off of Twitter and TikTok. Mastodon and open platforms will eventually win out in a divided social media ecosystem anyway, in my opinion. Divide and conquer.