The decentralization problem in BlueSky is not filtering out users, but rather hearing from users that BlueSky has decided to filter out.
People who want me to hear them belong to one of two groups: I want that, or I don't.
The second group may be expected to be overwhelmingly spammers and scammers, with a smattering of tankies and kooks, because the ability to reach the largest possible audience is attractive to them, right? So what you think, should each recipient maintain his/her own filter, or should the platform include some sort of common filter?