I feel like the only way to have this many "partners" as is to inherit them, at least if you're 'trivial'. Like, they probably chose some ad or tracking script that has so many partners.

I know, but we're talking about some free & open-source software funded by donations, not a for-profit company.

Funnily enough their not (fully) free and not open source competitor DaVinci Resolve doesn't have a cookie banner and doesn't set any cookies on your browser.