Most things passing through are public anyway, as lemmy is allmost entirely public. The only privat info is your password and wefwefs session. Those are visible in clear to the server, so could in theory be logged. If you change your password (and invalidate your sessions) after wefwef switches to direct you should be good.

This.

I can understand why people say all of this is bemusing and discombobulated, haha.

Stopping the stream of data is always possible. You can use google daily until you suddenly don't, the steam of data is (or probably just the proccessing of your queries in this case) stops.