This is the only reasonable solution for them though. If you don't close it like this, you could end up spawning a whole market, and you're no longer selling a

This is the only reasonable solution for them though. If you don't close it like this, you could end up spawning a whole market, and you're no longer selling a product (maybe not the most "optimized" product, but which still satisfies all parties), instead you're competing against this market of your own creation. Any sensible person would just add a clause to the terms.