I’m a mod of a moderately sized subreddit (~15k) with lots of people who use Reddit only to interact with that community. We’ve been trying to disseminate information about our official Lemmy, Kbin and Raddle alternatives, but adoption has been slow to nonexistent. So I’m probably going to stick around in both, if for no other reason that to moderate said subreddit.
No, it wouldn’t. The Beehaw server is located in the United States. External communities aren’t retrieved via your machine, but via their server.