It’s probably not worth the hassle to FB, but it is funny to think about how big of a business this could potentially be. But even a profitable business unit might not make enough profit to actually make it worthwhile.

It could certainly work. But it would probably be too small a business for a company as large as Meta. The differences in scales is (I think) one of their problems. At Meta scale (somewhat a pun), many things are just harder/not worthwhile because of their size.