Because lots of them look like outright scams and are fueling a bubble which is bad for everyone because they cause negative externalities [1] such as systemati

Because lots of them look like outright scams and are fueling a bubble which is bad for everyone because they cause negative externalities [1] such as systematic risk [2]. [1]: https://en.wikipedia.org/wiki/Externality#Negative https://en.wikipedia.org/wiki/Externality#Negative [2]: https://en.wikipedia.org/wiki/Systemic_risk https://en.wikipedia.org/wiki/Systemic_risk