I met my wife through eHarmony. I tried the other apps available at the time (mid 2000s) and most were “profile pic & swipe” level of depth. eHarmony had a fee (so both parties were at least a little more committed to finding a partner, rather than “sign up for free account while drinking one night”). Also it had maybe 100(?) questions you had to fill out before it’d give you any matches… basically a quasi personality profile about what you were like and what you were looking for in a relationship. The result was fewer matches, but all the dates I went on were meaningful (eventually leading to ~15 years of marriage & 2 kids).

There’s now additional dating sites beyond just eHarmony that have this barrier to entry which seems similar (although I don’t have personal experience with those).