Andrey Andreev sold out to Blackstone, a private equity firm [1]. The parent company of those dating apps you listed is now publicly-traded [2], but still majorly owned by Blackstone.

Still doesn’t change your point that there are two major monopolies in the online dating sector.

1- https://techcrunch.com/2019/11/08/badoos-andrey-andreev-sell...

2 - https://finance.yahoo.com/quote/BMBL/