Comment by ETH_start

Most of the scams happening in the crypto space involve a significant non-crypto element, like a fake website that is made to look another website, or social engineering through messages on Discord.

These criminals are well known by crypto communities, with repeat offenders targeting a given community numerous times over a course of months/years. Law enforcement has numerous opportunities to go after these individuals, even if they used a perfectly traceless cryptocurrency.

In the case of FTX, it was run like a traditional bank, taking deposits and holding users'crypto and fiat assets on their behalf. The signs of a fraud were replete for many months before the crash that exposed it all, but the company was simply never investigated.