Sure, then you'd get N contact requests which you'd have to ignore (which has the same effect as deleting a contact which you'd previously accepted).

But people can spam your email account as well. When this became a problem, spam filters were developed. There's no reason the same thing couldn't happen in Ricochet if spam became a problem.

Ricochet's problem isn't that too many spammers are using it. It's that almost nobody at all is using it.