they always show up with 2-3 at the same time, post up to 30 posts, then disappear again (for now)
today for example:
https://gfy.com/members/ban-svici/
https://gfy.com/members/jhem/
https://gfy.com/members/fappingjack/ (i might give this one the benefit of doubt)
Last week there were others - and the week before