Those aren't taxes.  Taxes are money that goes to the government.

Those are profits.  So you are complaining that bitcoin brokers has a bad exchange rate compared to other sites. You don't like how much profit they are taking. So, use one of those other sites that you think have a better rate.


If you know of sites that have a better rate than bitcoin brokers and localbitcoins, then why aren't you using those other sites?

Options that provide you with better anonymity, or increased convenience will cost more.  You have to pay for such services.