I produce content for YouTube full-time.
Just a few days ago a well-performing video ended up age-restricted. It was an edge case, and could have gone either way. I appealed, and included the best argument I could put together.
A few hours later I received this:
We have reviewed your appeal for the following content:
[the video title]
After taking another look, we can confirm that your content does not violate our Community Guidelines.
Thanks for your patience while we reviewed this appeal. Our goal is to make sure content doesn't violate our Community Guidelines so that YouTube can be a safe place for all - and sometimes we make mistakes trying to get it right. We're sorry for any frustration our mistake caused you, and we appreciate you letting us know.
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I appeal YouTube's decisions all the time. Sometimes appeals go my way, other times they don't, but that doesn't mean there is no serious appeals process. As far as I know, almost every adverse decision can be appealed.
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About your last comment, the existence of a problem doesn't mean that government stepping in would be better.