原推：@iyad_elbaghdadi I remember some internet forum (somethingawful maybe? I forget) gated accounts with a one-time $10 fee, which you lose if you get banned, and no further verification, and it actually worked pretty well?
There is definitely a price level at which the cost to spam becomes too high
https://twitter.com/VitalikButerin/status/1589798651211440128