Neither Grindr nor OkCupid are non-profits. As the apps are free as in beer, if you don't pay with money, you pay with your data. If they didn't sell data, how would they make money? How would they get those valuations? If paid dating services do this, which they probably do, I agree it's scandalous. But in this case, it's more or less implied. Of course it's sad that so few people are aware of this fact.