I don’t have strong opinions about BlueSky (I have an account, I prefer activitypub but it’s whatever), but to me I will view it as centralized until someone who is not BlueSky runs a second relay server that is federated with the BlueSky run one.
And based on the writings of one of the creators of activitypub, Christine Lemmer-Webber, there are some hurdles to that happening: https://dustycloud.org/blog/how-decentralized-is-bluesky/
This is great to hear, dansup has been stretched across so many projects for so long so hopefully this really supercharges pixelfed (and friends) development and helps to increase the diversity of AP servers.