By "free use", I mean modification, distribution, whatever one would like, but if it is used commercially, then adopting companies would be obligated to support the maintainers.
There is a similar thread on Open Source but it doesn't apply here because I don't mind commercial use; I also don't care if the license I'm looking for is filed under "open source", "free software", etc. until it satisfies the above parameters.
The reason I'm asking is that it could be that others already tried, and it was determined unviable, but I couldn't find anything.