Maybe you could limit the number of verifications a key can have in a day? Limit it to say 10 verifications per day. So if you're on Pornhub and have an account, you can have the key associated with the account, verified, and so you don't need to re-verify. But if you go on 10 completely different sites and verify for each one, you can't verify after that 10th one within the same 24hr period? You could maybe also include guidelines for integration where if a key is associated with an account, that key can't be used for any other account. You can include that under some requirement that says you have to make 'best efforts' to ensure that a key is only ever used by one account at a time. That way, if a million people are sharing the same key, you'd have to trust that all one million of them will never associate that key with their account because if they do, it invalidates that key for every use other than through that account on that site.

Windows isn't little-known.

i used to work for secretary of state police and driver privacy was taken deathly seriously. glad to see alexi’s keeping up the good work.

What is the connection to technology here?

WTF I looked for something like this for a while and this never popped up. Awesome.

It's also much easier to implement.

Why doesn't Amazon just sell a generic printer that works with generic toner or pigment or ink. I would buy.