It is not the only reason why Bitcoin is allowed to continue, there are a lot of reasons to let Bitcoin to continue and the first one is because it is decentralized.

Bitcoin is a decentralized cryptocurrency. No one can really stop it, nor fully control it since no one really owns it. Even if we have a lot of Bitcoin, in general we don't really own it, we can just access that part of the Bitcoin that we own. Since Bitcoin is decentralized, it can continue as long as investors and traders continue to use it. The only thing that can stop it in a country is by the government banning it.