Maybe not 300k but /r/overemployed has a private paid discord that I checked out for one month out of curiosity, there are some extremely legit appearing people in there showing their setups and I fully believe the $$$ figures they are throwing around on the discord, not so much the sub itself but definitely on the paid discord there are some people with multiple lower 6-figure salaries laughing all the way to the bank while more upstanding people are carrying the bulk of their work load.