@rysiek I wouldn't say I'm insisting on it, I explicitly said your mileage may vary. (Also I noted that your cosplaying decentralization article was before Blacksky existed, so there was a very good reason for not mentioning it!.). To me, Blacksky is the most interesting thing about Bluesky, and them running some of their own servers today (and potentially more tomorrow) is a key part of it ... like I said, that sounds decentrailzed to me. But I also agreed that the critques of current power distribution and likely evolution are valid and important, so I understand why people who focus on that prefer to say things like "one layer is decentralized, others aren't and probably won't be, so it's not decentralized."
So If there's a different way to talk about Blacksky in those analyses without considering the inependent infrastructure they're building and their vision as an example of decentralization, great, But what I'm seeing instead is people not talking about it.
In terms of Blacksky providing an alternate relay, it sounds like you're assuming it would be a whole-network relay and that it would archive the data as Bluesky's Relay currently does. Neither of those are required. And in any case, 16TB isn't ridiculously expensive these days.