I have a roommate who used gitlab. apparently the current ownership is extremely profit motivated, and they still respond to DMCA takedowns.
No real upside except microsoft not owning them. Can’t even actually subscribe monthly last I’ve heard. Like, they show a per-month price, but you still have to do annual payments.
Self hosting comes with administrative and financial burdens, something that the F in FOSS doesn't really help with, hence using a free service that deals with that for you.