@cwebber This is different from e.g. Google because Google offers an opionated view of the web. The Bsky appview is more Google Reader than Google Search (as you've pointed out).
I think the "headcanon" is that anyone can make their own relay (or even did:plc maybe) because these are thought of as (caching) dumb pipes to the underlying data. There's no *reason* to run an alternate relay so long as the official one acts as a free dumb pipe, and the possibility of making one keeps them honest. /3
@cwebber But I think you're right that this starts to come apart at the seams. In fact, as you pointed out, the relay isn't neutral. It deletes spam and removes illegal content.
That's important not just because of the operating costs, but because it means that the headcanon one-true-AT-network doesn't really exist; what exists is something much more centralized and hard to duplicate.
I don't have a good response to this. I think if you want relay independence, Bsky isn't likely to cut it.