You well state matters as they stand. It is sadly difficult to deny the mathematical realities that, just as taxation keeps financial assets concentrated in the hands of those that can afford tax attorneys and offshore machinations to dodge paying taxes, DV's concentrate stake in the wallets of an oligarchy.
What to do about that, when we depend on a network that isn't facilitating plagiarism, spam, and scams, isn't immediately obvious from an understanding of the problem of unrestrained taxation. Simply removing one problem doesn't fix all the others that erroneous fix was an attempt to solve. In biology, there are similar examples of introducing a predator of an introduced pest backfiring when the predator further exacerbated ecological harms caused by introduced pests, and trying to stuff the toothpaste back in the tube is notoriously impossible.
As you undertake here, practical solutions that don't themselves cause different problems, such as DV's concentrating stake in an oligarchy, aren't just magically obvious, and requires discussion, and even inspiration, to arrive at potential solutions.
Thanks!