> So the cost to spammers is literally a million times higher than it is for ordinary users, which is exactly the sort of thing that actually works.

The law-abiding user is the one that incurs the real cost. Spammers pump and dump millions of IDs. This drives up the cost of getting an ID. The normal user that just needs a new ID for some reason is the one that suffers the most here.

I don't care if it's expensive for a scammer. If it's cost-prohibitive for grandma to get a new ID, then it defeats the purpose.