Also Blueskys mission has changed. It is no longer a "decentralized" platform, it is now a platform for left wing refugees exiting Twitter. I'm guessing 99% of the new Bluesky users don't know, understand or care about decentralization.
Discussion
What are Nostr users' thoughts on decentralisation is a good question. If nostr.stats is correct then Nostr just had it's lowest day in four months, i.e. since the start of the winter Nostr has been shrinking. Why then are people leaving? Do they feel Nostr is becoming more centralised? Or is decentralisation a secondary concern, the issue lies elsewhere?
I'm not sure, but if decentralisation were a top concern then we would not be seeing relay usage clump up in this way. At the very least we would be seeing more of a fuss about the state of the relay network and shouts to get Outbox working well. I suspect Bitcoin and social patterns surrounding it are more top of mind for Nostr users than decentralisation, and the reason people are leaving is they are getting a little bored of that conversation.
You raise some good points, personally i'm on Nostr for decentralization first and social second, and even I find myself resorting to Primal and one or two primary relays just so it works.
Majority of people just want it to work, I get that. But if we sacrifice decentralization then this is dead in the water and I move on.
As to why are they leaving, who knows, bored, sick of the bugs? Most people want to maximize influence and network effect, if they don't see Nostr as growing they will leave.