I'm kind of new to crypto, but i have a question.

I know that mining cartels are a huge problem, so much so that regular people can't mine anymore.

I was wondering why can't they introduce some kind of limit of how much work one node can do per hour? Wouldn't that massively aid the problem?

I'm no programmer, so I'd really appreciate hearing thoughts about what solutions people are coming up with to solve this problem. Is it unsolvable??