A few greedy people get lucky and pull out of the bubble with returns. Most greedy people get burned by their get- rich-quick gambling.
This is not anything new or terrible. Of course, all of this craziness can be used to mask genuine scams or scamish-marketed "investments". Those are what the Feds need to chase and prosecute. There are plenty of cryptocurrencies (and inflated stock evaluations) that are genuine pump and dump scams. These pump and dumps really should be prosecuted harshly.
We really need to get over this idea that we can regulate away losses and negative outcomes of basic stupid human behavior simply because it seems like an ideal that we be able to do so.