If US citizenship has a whole lot of advantages that mean you want to keep it, then the price is perfectly clear up front: you are bound to the US tax code.
The tax evasion for which he was indicted covered 2014 through 2018; while there are gaps in the information I can find quickly about his residency, in 2015 he apparently resided in Tennessee (and in 2013 in Oregon). So even if we were to accept that taxation of nonresident citizens was fundamentally illegitimate, that wouldn't invalidate all (possibly not any, again, I can't find any nob-US residency information in the covered period, only once he announced he was on the run from the tax investigation in 2019, and some before 2013.)
And even if all the tax allegations were grounded in illegitimate taxation, there's also the securities fraud charges.
I'm certainly not excusing his actions (and I'm sure he dodged taxes in many ways), but I have to say that as a Spanish citizen having lived in the US, Ireland, and now Japan, the US tax code is batshit insane.