Yea I'm just asking that question in a Socratic way, just to get ideas moving. I could see people regretting getting the jab, and trying to pretend it never happened. I think the possibility of this could, from a game-theory perspective, render such a "pureblood" dating app completely ineffective.

But I could be wrong, it could be that not enough liars use the platform, and meeting people in person and getting to know them will reveal in time their true worldview.

I mean, it's the same with dating Christians. You go on a few dates and realize they call themselves Christian but they really aren't interested in what the Bible says, nor in attending Church together regularly. You just get to know each other and these things come out in the open. That's life I guess.