No matter what the movement is, if it's large, then there will be some large corporations, governments, etc. behind it.
That doesn't mean it's fake or it's not grassroots or it's not real. It just means that it's big enough that the constituents of The Establishment (CEOs, elected officials, corporate workers, etc.) are joining it as well.
Just as if some shadow organisation is behind everything someone doesn't like.
The world is changing, people. Like it or not.
Most establishments are gaining power. Right-wing authoritarianism is taking over governments in the US, India, and Poland. We are in a new Gilded Age, where people like Elon Musk can openly commit crimes without punishment and Peter Thiel can select Senate candidates. The CCP is gaining power and big banks are buying up cryptocurrency.
The only failing establishment I know of is organized religion, and even then, Islam and Christian fundamentalism are doing just fine.
The supposed examples of grassroots level action are being organized/directed and inspired by people already in positions of influence in traditional establishments. That's not too surprising I suppose.
There's an unspoken implication here that'd I'll make explicit: the supposed goals of these movements are not the true motivations of the people most responsible for driving them. They serve the hidden interests of the groups pushing them first and foremost.