Some of these open source licenses are somewhat flawed when it comes to building a business on things that are "free".

Wouldn't it be possible to add a clause to some of these licenses that if you are using open source software and generate a certain amount of revenue from it, something has to be given back to the project.

I totally understand that the software is meant to be free but isn't there a balance here, where at some point it must be enforced that some the money it generates in a business, must flow back to its contributors/project ?

I have worked plenty of places where Redis was a thing that served at least some backbone for success for a business. Those places could pay a fee for generating revenue based on free software ?

Does it make sense ?