What's the thinking on BGSes? I haven't seen much talk of who's expected to run them or what they'll look like, but they seem to be the linchpin of reliable data portability.
Anyone can run a Relay. They're somewhat comparable to Linux distribution FTP/HTTP mirrors.
Bluesky will always run a Relay, but other organizations will hopefully as well. We expect these might be organizations doing other things in the ecosystem, universities, and possibly open consortiums.