Clear licensing conditions included with the prop would go a long way to help avoiding threads like this. Most I have found have been pretty good.

I have a simple attitude ... if I can abide the the terms I will use it. If not, I find something else or attempt to create my own facimile. It may even require me to rethink the project into something I can manage.

Definitely not worth stressing about.

Just my humble .02 :-)