Browser extensions are probably the most convenient option, especially for the layman, but there is always DNS-based blocking and/or local proxies like privoxy.
Well I can’t know what you’re talking about precisely because you didn’t give any examples, but my sense is that people involved in things like Wikipedia are going to lean (American) left because Wikipedia is socialism and it embraces progress. Most of the rest of the world is left of the American left and Wikipedia is also international, so that would exacerbate things to some degree.
Just a fun anecdote, I showed up to pickup my own online order at a restaurant. The order had been given to a dasher and delivered to someone else, with the same first name, who was now furiously calling the store. They got about double the amount they had ordered, but they must have really wanted the shrimp. I then had to wait for that call to end just to find out my order needed to be remade.
I am not sure but the CEO of nvidia might be slightly biased, and possibly out of touch. Not saying it’s not possible, but this is the last person I would ask.