>Problem: stock booms result in massive fraud and a great deal of economic damage.
>Solution: regulate the stock market.
If people want to trade the price of a digital token into bubble territory, that's really their business. No one else is forced to buy up that token. Which governing authority will know it's a bubble anyway? It's not like it's possible to know if something is overvalued. If it were, one could reliably short every bubble and make a profit, and in fact do so so much and at such scale that their market shorting prevents bubbles from ever forming (since a short adds pressure on the sell-side).