i work at a dating app and number of fun dates (worded slightly differently) is our north star metric! it's one of the major ones, and it has helped it stay relatively non predatory :)
That's the thing with dating apps/sites. If you succeed too well, you've lost 2 users.
I'd rather a "pay for 3-6 months of full access upfront, a 3 day trial option" than a subscription model for anything where there's a chance i won't be using it in 3-6 months. when i see a dating site ask for a year upfront i know they're not going to actually help me.
I met my wife (and two close friends) on OKCupid over 15 years ago, so i remember what it was, and what a site could be again, just not OKC
the longest i've seen is 6mo (at least thats OUR longest) and while fewer people use this, it captures the demographic that is either self aware and think they'll need it for a long time, or folks that are happier with dating around. the point of these longer subs isn't because we're willingly creating dark patterns to avoid helping our users, i promise
also, the company i work for is focused on more serious relationships. we are focusing heavily on reducing ghosting, lowering treating people like they're disposable, etc.