You can't enforce 'spam is illegitimate'. You can try removing some types you don't particularly like, but it's naive to assume doing that will actually make Bitcoin more monetary. And what if it doesn't?

What if you are not satisfied after fork #1?

What if the spammers whom you stopped to spam look for the next way?

How many spam forks are needed when enough is enough and realize people who want to waste money trolling (or launching scams) on the global permissionless decentralized monetary network will always be able to do so.