Is this insider trading according to the law? Nonpublic information isn't being used to trade public stocks; it's being used to trade assets that don't appear to be regulated securities.
To add to what you're saying, forex explicitly does not have insider trading rules. The problem is it's treated as a general asset. It feels like there should already be rules in place to handle if, for example, an Amazon exec went and bought property around an area prior to Amazon announcing their new HQ.
One solution is to go a step up the meta. Ban trading for certain groups or classes, like banning parliamentarians and government officials. ..but spouses, kids, friends and cousins make for a pretty substantial loophole.
That said, not regulating against insider trading bleeds very quickly into market manipulation and corruption.
Not sure what the ansers are. This is a very dirty part of the game game. Crypto brings in a new set of players, and it takes years before they'll learn to do this in a way that maintains a stable plausible legitimacy.
We absolutely cannot have second tier people insider trading and rigging markets. It's antistabalizing.