When the government steps in, it's not usually to say _you_ own it but rather _they_ own part of it. If you own it of course you owe them nothing of it. Government finally getting their greedy hands out of private property would be a huge step up.
This is even more obvious when I present it this way. Yesterday there's a cow in my yard. The next day my neighbor says he recognizes the cow as my cow. The neighbor has ceded over power of the cow, now recognizing I have full control of the cow and they're removing any claim of power they had. It's a contraction or break even of, not expansion, of my neighbor's power.
Ownership means you have full control over your crypto. Paying taxes on it means you don't have ownership, but rather partial ownership. If the state is conferring you full ownership, it would appear their power is decreasing. If the state is taxing crypto, then they're taking away ownership status and instead attributing some of it to themselves -- THEN it's an expansion of power.