Ok, let's say they're 90% of the market, and that's close enough to 100% for them.
Why are they so involved in social change, politics, bringing us towards Communism, and suppressing/censoring the truth in so many areas?
Because they are EVIL, that's why. It's not just about money for them. The devil isn't going to do 9 evil deeds and then one beautiful, virtuous one. No, everything the devil does furthers the devil's aims. And the devil has NO good aims or goals for humanity, that's for sure.
That is very simple to answer.
Democracy or democratic based power is dangerous to billionaires as the middle classes see that they have been fleeced they will enact laws to take the money back and investigate their criminal wealth, tax dodging and money laundering.
No amount of lobby funds can stop a government taxing their assets of making them exiles who have to live in a tax haven.
They have to censor the truth to keep their vast fortunes. And they are tiny in number. They essentially want to bring back a sort of digital godless feudalism, not communism.