When I was young I remember that banks often had large drive-thrus with pneumatic tube systems at each car stall.
There would only be one teller but they could serve quite a few lanes.
If you wanted a cash withdrawal, you might put your ID and your withdrawal slip in the tube, and a few minutes later it would come back with cash in it.
It was pretty rad. But ATMs seem like a better bet overall.
This seems like both a feature and a bug with the fediverse. Some topics just fit a lot of subs and then you multiply that by all the Lemmy instances. It seems like the discussions around big topics can really get spread around.