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Maybe not from a single spammer, but there are so many spam bots that any form like this you put on the web will be hit by a flood of bots

Agreed.

It’s taken me a couple days to put it into words, but the important thing for me was a product lesson.

The lesson was that it’s possible to lower friction to this point, build or buy an anti/bot/spam system and still have margin.

Yeah there would be absolutely no benefit to doing this other than just to be a nuisance.

Nope, there would be zero benefit other than to try to cause a bit of trouble.