The best example of this is the People's Bank of China(PBOC). They were desperate to stop bitcoin from taking over their place. They are trying to regulate bitcoin which cause panic to people. They spreading FUDs from people. Bitcoin is a real threat to banks. But i dont think bitcoin can replace banks.
It is not exactly the whole truth about PBOC intervention. Sure they are seeing Bitcoin as their competitor, but so far they didn't try to ban it openly.
I am not sure you know how "liberal" were Chinese bitcoin exchanges so far, their main source of income was high limit margin trading - and PBOC halted this behaviour.
So in theory new reduced margin trading should lead to lower price volatility.