Why?
>legal bribery like funding opposition environmental studies to block competition or funding lawsuits to change laws they don’t like or anything else they can legally leverage that financial wealth for.
Make it illegal, you are literally listing the specific things which shouldn't happen. Where is the problem?
>but the sort of large scale socioeconomic and sociopolitical reforms needed to do this
You just gave a list of issues. Ban every billionaire from contributing to lawsuits. Ban them from "donating" to anything and actuslly punish them for violating the law.
>just taxing the billionaires till they aren’t billionaires anymore.
This is just seizing corporations by the government. And the problem is that you expect politicans to move against their benefactors.
The problem is that people who have the power to make it illegal are the same people who profit from it not being illegal.
EDIT: your username is so emo, lol. I love it.
If you can't even do the later the former is obviously impossible.
As ideally we could separate these two forms of power and achieve the removal of the unaccountable informal power… but the sort of large scale socioeconomic and sociopolitical reforms needed to do this honestly seem harder to achieve than just taxing the billionaires till they aren’t billionaires anymore. Maybe then we’ll be in a position to try and start the reforms and could have the sort of world where money doesn’t buy you unaccountable power… but I think that’s not something that would be achievable in my lifetime.