Hmm. Yes, lovely.
Any contract carries strings, even if it's just the psychological burden of implied expectations  or an unpleasant affiliation.

So, if I'm already building something I'm enthusiastic about, and someone says, "Hey, can I pay you to add this doodad to it, so that I can use it for this new use case?" that might be a good contract to consider. Other contracts are less appealing.

Each contract needs to be examined on a case-by-case basis. And rejected, if necessary.