As we know nowadays everybody uses cryptocurrenies and specially Bitcoin in their trades and criminals too. China recently declares blockchain illegal in that country, How likely do you think is that other countries ban it?
If they start to ban it, what would be happen to bitcoin price?
An outright ban is possible but unlikely. will certainly happen in places with a religious objection, and places with suffering economies that cant afford the capital flight that bitcoin affords. but regulation is the more likely outcome, as a ban would likely IMMEDIATELY cause massive capital flight (nobody is going to just sit there and eat a loss for no good reason, people are going to liquidate as soon as possible).
price will do exactly what it did on the China rumors, as this was essentially the worst possible outcome that everyone was fearing. go down shakily until the news is concrete, then rebound.