Some do it just to meme or be funny. Especially ones that make these kinds of posts.

The ones you really have to worry about are the ones that get mad when you mention something about a character that is not accurate. They will publicly execute you. Worry about those ones.

Are you really surprised these gachas attract tons of horny teenage coomers with waifu baiting as a business model?

I would guess the absurdity is the point. People trying to make each other laugh. If it bothers you, you don’t need to be there.