they sell your data. they sell ads. they have optional features you can extra for that are expensive and some people use them. i have been using dating apps for 15 years now. they haven't changed that much. it's just that they are all swipe apps on your phone now. but the business model has been the same since the 2000s, it's basically freemium service like free to play online games are. and it's profitable because while the vast majority never pay, the small number who do, spend a lot, and are called 'whales'. the business model is all about getting the whales. people like me, who have never paid once in a 15 years, aren't really making them any money.

again, you clearly dont' use apps and you're just making stuff up.