So, in conclusion and IMHO, BlueSky is a successful Twitter alternative.
The Fediverse including Mastodon is not. The fediverse is fundamentally different due to its truly federated nature.
And both can have their place in the market of attention.
One ultimately is a commercial endeavour while the other is not. But for the general audience that simply is not the decisive factor. One can find that A Bad Thing, or one can shrug and move on in ones preferred direction :)