This isn’t new. It’s generally applied to specific uses, and match in the dating world has legitimate brand recognition to be protected. I think the whole thing is BS, but it’s not a secret, and musmatch/YC should be no more surprised by it than someone starting a fast food joint called McChipotle.
Your analogy doesn't really carry over. If McDonalds or Chipotle were called "Food" then imo it would be a dick move to sue a smaller restaurant chain named GregFood. (As to whether they would prevail, I have no idea.)
