I'd guess because your comment had nothing to do with the video, and was just an ad hominem attack. Not everybody wants every community turned into a political one.

PTB. Fuck bill gates and fuck his phony pseudo-science channels.

Here's all the community rules:

• Submissions must link directly to a video between 5 minutes and 1 hour long.
• Use a duration in your title such as [9:27].
• Be mindful that some people will be watching this while eating. No ‘gross’ content, no NSFL, racism, bigotry, etc.
• Use a title that is descriptive of the actual video.
• Be respectful of other submitters and commenters. Personal attacks, hate speech, bigotry, etc will not be tolerated.

I agree with you that your comment didn't break any rules, so PTB. They don't have any rules about "civility" towards content creators. If they think they words "fuck off" are too much to deal with over a "mealtime", then they should probably implement a "no swearing" rule. But also, get real... that's how real people speak ffs. If they only want SFW content, then make it an explicit rule.

In 2015, the channel received a US$570,000 grant from the Bill and Melinda Gates Foundation.

That was 11 years ago, so I don't know how relevant your question is tbh. But there is good reason to wonder if Gates' philanthropy is taking a turn to the right, since he is being praised by "The Hill" and other right wing sources for withdrawing funding for left leaning organizations: https://thehill.com/opinion/finance/5522092-bill-gates-may-have-just-set-off-the-death-of-far-left-tainted-philanthropy/

The Gates Foundation is said to have severed ties with Arabella Advisors, which has received over $450 million from Gates over the years. With a reported 425 employees, Arabella is the hub of a vast network of Democratic and leftwing groups, and Gates’s cutoff was, according to The New York Times, “a symbolically significant blow to a powerful player in liberal politics.”

And Gates has now backed off his claims that manmade global warming or “climate change” poses an existential threat to the human race and the planet. He still asserts that “climate change” is at least partly the result of human activity, but acknowledges that fears of catastrophe have been exaggerated.

I think it's fine if they don't want to be a political community, but then they should probably adjust the rules accordingly.

If Hitler himself walked up to me and said "Here's eleven million dollars for your Youtube channel," I would take it.

Definitely PTB