Only if you choose to use bluesky PBLLC's relays and it's super trivial to not do that. Plus you can run your own relay super cheaply.
Side note: it hasn't been called BGS for a very long time. Nowadays they are just called relays and since sync 1.1 the cost for running a relay decreased by multiple orders of magnitude.
alt Hacker News
Only if you choose to use bluesky PBLLC's relays and it's super trivial to not do that. Plus you can run your own relay super cheaply.
Side note: it hasn't been called BGS for a very long time. Nowadays they are just called relays and since sync 1.1 the cost for running a relay decreased by multiple orders of magnitude.