Earlier quoted context omitted.
Airbnb doesn't have network effects, the value to users increases pretty linearly with the number of hosts, and doesn't really increase at all with the number of other users.
Also ignoring most cities now are banning or highly regulating these illegal hotels in residential neighborhoods Coinbase seems less threatened by regulations
There is also an "inverse" regulatory risk for Coinbase. In the best case (where cryptocurrencies are actually being used as payment systems at any significant scale) cryptocurrencies fill a need that is not being filled by existing banks as a result of regulations on the financial industry. Instead of more stringent regulations being imposed on cryptocurrencies, less stringent regulations could be imposed on the mainstream financial system that would allow banks to create more convenient electronic payment systems. The need for a cryptocurrency exchange could implode if the relevant technologies (e.g. offline ecash) were deployed; you would "withdraw" or "deposit" money in the bank just like paper notes. There is even a case for such a system if banking regulations became stricter e.g. if banks were forced to deploy a less fraud-prone and more privacy-preserving system than the credit/debit card system in use today.