And once your spammer has been identified then that's them banned/removed, unable to sign up again.
Would you have to submit a dispute with the internet credit agencies? Maybe join a class action suit against the entity that leaked your ID so that they're forced to give you a year of free internet identity monitoring?
We should be reforming our current credit agency system, not empowering it with a new mandate of judging somebody's social or political creditworthiness.
Keeping with the cloudflare topic, if Cloudflare only permits you 10 requests per second (HTML + JS/images) that's still usable for web browsing, but someone running a cloud of hundreds of bots would be effectively shut down. Similarly with email, an individual probably doesn't need to send more than one email per 10 seconds but email spammers wouldn't find any ROI at that rate - business needs being different might necessitate a different registry or something in that case.