That's begging the question!

If The Match Group is a steady supplier of startup exits in this space, that should incentivise more people to start. So we should see more people trying to resurrect old school OKCupid, not fewer.

Though I suspect the answer isn't that people aren't trying, but that these trials don't succeed enough for OP to notice.

Every site requires enough people using it to make it worthwhile. This is especially hard outside of major cities. The more apps there are, the smaller the pool in each one. This is a problem for having too many app, and also a problem for the early days with any new app.

For users, these apps exiting by selling to Match is a bad thing. I’d want an app with a very stubborn founder who hates The Match Group and wants to take them down by making a better product. Anyone starting with an exit in mind has already failed in my book.