> because again no banks are involved which might also go bankrupt
> Highest liquidity
I'm not sure what you mean by this. Banks certainly are involved, and provide the liquidity you mention by facilitating transactions for exchanges between crypto and traditional currencies. A disruption to this process either with a beneficiary bank or as an intermediary bank[1][2][3] ripples through the ecosystem. While yes, it's possible to interact with Bitcoin without involving a bank if you mine it yourself, the moment you involve an exchange and want to liquidate your bitcoin for more commonly accepted currency (or the other way around), you indirectly involve traditional banks. And if exchanges can't provide liquidity, then the value of bitcoin can and will drop precipitously.
[1] https://news.bitcoin.com/bitcoin-exchanges-victim-banking-pr... [2] https://medium.com/@whalecalls/taiwan-aml-reforms-usd-crypto... [3] The above articles mention the issue was related to new regulations. But insolvency of intermediary banks (or even beneficiary banks) could cause similar issues in the future as well.