Crypto is too hard to use — or more specifically, requires too much financial and technical acumen to understand — to make it profitable for someone to operationalize a mass-market "volume" scam (a scam involving stealing small amounts of money from a large number of people) based on it.
"Volume" scams are the really successful scams — the ones that fly under the radar for years/decades because no individual person is ever out for enough money to make large institutions upset to the point of pursuing them. Tons of "volume" scammers get their start every day.
The opposite kind — the scams where large sums are stolen from relatively small numbers of people — are flashy, but ultimately futile, as high-value scammers almost always get caught, and quickly.
"Volume" scams are the really successful scams — the ones that fly under the radar for years/decades because no individual person is ever out for enough money to make large institutions upset to the point of pursuing them. Tons of "volume" scammers get their start every day.
The opposite kind — the scams where large sums are stolen from relatively small numbers of people — are flashy, but ultimately futile, as high-value scammers almost always get caught, and quickly.