Many stats show that the younger generations have less friends, have less sex, etc. They value a life partner or romantic partner more for the stability and less for the "thrill" because living with a permanently online record of their lives and the viciousness of the entire Internet being able to "cancel" you for things you said or did years ago has made everyone a bit less thrill-seeking, a bit less adventurous, etc.
And that doesn't really vibe with dating apps that encourage meeting someone you don't know, your friends don't know, for what's probably going to be a short term relationship.
I think it's a bit of a pendulum effect. We went really hard into hookup culture in the 2000s (just check out all the American Pie type movies back then that would never be made today). Now people are swinging back more to wanting stable relationships that benefit on paper rather than in our hearts and all.