Being a cryptocurrency user is all about NOT paying taxes. As more people understand the systems of cryptoanarchy, more will the gateway business models fade-away(basically exchanges and add-ons like OP).
Banking fees, sure. But taxes? That's a whole ideological discussion not even closely related to crypto.
Taxes are not a financial intermediary. Taxes are something a government charges to fund a country, even though some of them may be charged when you move money around.
I understand that we can somewhat envision a self-governing crypto-nation, but even that doesn't imply lack of taxation.