They bought out as many of their competitors as they could get their hands on, and then bolted on the maximum number of dark patterns to their apps that was humanly possible. Their CEO is the former head of Zynga, what else do I need to say?
I dunno that regulatory action would have any meaningful effect here. These apps come and go every few years, the users have high turnover, and there's not even an exclusive network effect like regular social media has. If you break them up into a bunch of smaller ones, they'll just re-consolidate over time.
What about a nonprofit/open-source dating app instead?
Perhaps stating some sort of concrete claim might be a start.