Grindr barely has any features, it’s basically a site for people who are cruising for sex, like a decentralised gay sauna.
Gay guys (I am bi and use it) just need text and photos to show off their pecs and dick pics. Grindr has successfully constructed a dick pick delivery service that works, put some ads and a Grindr plus if you want to talk to people further away and that’s it really.
It’s not been product market fit, it’s product market perfection. There is no need for any new feature and I haven’t seen them add any in a decade.