Just because some countries have big mining farms doesn't mean that they control the entire crypto market. There are a lot of players involved, each looking for their own benefit. Whales and big exchanges are the ones who control the market the most. That, and also the fact that mainstream events can have either a positive or negative impact over Bitcoin's price.
All in all, I wouldn't worry much about the price, since it's all driven by speculation. With the ability to trade Bitcoin "over the counter" and through decentralized exchanges, it may be impossible to control or manipulate the entire market. Only centralized exchanges are easy to manipulate because of their single points of failure. Bitcoin is truly about decentralizing finance, so as long as it does the job well, nothing else matters.
Another thing is that even if one country should ban cryptocurrency, and they happen to be the location where majority of the cryptocurrency mining takes place, the cryptocurrency mining farms would still move their farms and relocate to another country where things would be in favour of them and they wouldn’t have to face any problem with the law by mining cryptocurrency. So, the location doesn’t really matter, it doesn’t matter whether a country has majority of the cryptocurrency miners, no one is actually going to control Bitcoin.
We can see even when China decided to ban Bitcoin from their country, a lot of the Bitcoin miners there decided to move to other countries. We started to see increase in the mining share of other countries such as Russia and the US.