1 If the bitcoin becomes a bubble and burst. This will be linked to the flash crash but this time that looks impossible.
2 If the exchange site will be banned in the various country because of the exchange site as a centra key in the bitcoin or crypto.
3 Too many hackers, scammers in the crypto.
A lot of the things that makes me fear about the bitcoin itself. But the politic and regulatory seems to be a serious thing rather than other.
We are of the same opinion.But for me personally, the greatest fears are :
1. There is no exhange sites anymore because have been banned and controlled strictly by the government.So bitcoin can not be cashed or converted to local currency.
2. Government regulation that officially banned totally the existence of bitcoin operating in the country.
We all as bitcoin lovers expect together that these dont't happen and let bitcoin grows based on market mechanisn. Probably government only issues regulation to monitor the negative sides / impacts of bitcoin .