The thing is that there's no enforced tax. It's a pay-what-you-want. There are txs with zero fees that have been mined before, although today that's not the case (and such txs will likely be dropped from mempools).

If a central bank gets to own the largest mining farm to take all taxes, then those who care will simply fork off. There are solutions to most (if not all) of those problems, thanks to decentralized governance.

Remember that Bitcoin will change in the future, and fees will likely become much smaller so that the average Joe will afford to pay them. Even today, you can pay as much as you want so if a bank was to own a large % of the mining power, you could pay 1sat/byte and still get your tx confirmed IF the bank doesn't censor your tx.

If this ever happens though, we will have much larger issues to confront: if the banks purchase enough mining equipment to own a % of the hashrate so high nobody else could compete with it, then it means they own a % of the hashrate so high 51% attacks become a thing. Bitcoin is about decentralization, about NOT letting a single power own the majority of the votes. Thanks to BTC's nature, we can solve these issues without a doubt.

The majority of people just hate gov, so they ready to pay money for anybody instead of gov

They're both imposing tax at their own rate and I don't see anything that can be detrimental to network fees compared to fees on paying the government. I believe they were both regulated in a certain amount or cost and it is up to you if you want to adapt with the current taxes it imposes.