1. it is a decentralized currency that nobody can control, censor, tax, restrict, ban,...
Price of BTC can be manipulated indirectly. Oligarch can still dictate the price. So still they can control the price.
Every country can tax a btc if they want to. They can do that in the payment. They can dictate the banks and other agency to tax the money from btc.
In restriction and ban it already happening in other country (like Bangladesh).
Bottom line BTC is no immune in manipulation. As long people in power wanted to, they can do whatever they want.