In the legal sense, "personhood" just means an entity can appear in court and defend themselves, not that it's made of people. It doesn't even give the corporation any human rights, it mostly just means that you can sue them
I don't know why anyone would be mad about than
Youtube ads don't just pay creators though, they also pay for video hosting, discovery, and streaming, which aren't cheap. A lemmy for video streaming would be great, but there's a reason it hasn't really happened yet, you'd need a much larger portion of viewers to pay than what it takes lemmy to run, and you'd need a bigger community of developers to build it, which is why most youtube alternatives are strictly paid products. None of that is criticism of the idea, I think it would be great if we could wrench away some of youtube's monopoly, but at the same time we need to understand why it's a challenging concept