Yeah, the other thing I could see happening is a similar tactic used by scammers where they use Mules who pick up mail from various Airbnbs throughout whatever country, but this would definitely limit most bot operations… Unless some organization specializes in this and just offers some service to create a bunch of accounts for anyone willing to pay.
Also, how many accounts would you limit to a single address, and how long would you lock up an address before it could be used again (given that people do move around from time to time).