They do. I had this conversation the other day, and it led to Bill Gates trying to to basically monopolize farming. It was right before a five-hour meeting and so I forgot to research it at all after, but you have just reminded me.
Back on topic though, I can’t find seedless watermelons anywhere. I live in Jersey (New), and my local supermarket is and has been seedless for at least a decade. I can’t recall the last time I enjoyed watermelon with a seed. My presumption was that they’re stopping us from growing them at home. I’m sure it’s much more (or less) nuanced than that. I’m an idiot.