My dramatic backstory time, grab popcorn if you have any, tissues not mandatory;
I once did work as part of a team, with people I thought I could trust, for years, I felt like I was part of something, we made simple and entertaining games for people that couldn't afford to buy those.
I am fairly good at making rpgish music and graphical assets for indie games, my role was to 'build' what they lacked, then one day I find out they were selling / distributing those very assets behind my back as their own creations, I wasn't told nor informed of this, I only noticed because games with my assets begun to pop up in 3rd party sites, I kept my silence and ceased to create anything new as result, these people then asked me if something was wrong, if I was sick or something, when I suddenly stopped making any new content.
Only then I confronted them about my findings over their actions behind my back, they had betrayed my trust, used me only for their own profit, when the deal was that everything we do is non-profit, assets wouldn't be profited upon nor given to other people to be used in their commercial projects, they did so regardless for who knows how long, and what they did after was simply erase my entire history with the group, to them I was never part of it, simply a fool to exploit on, I thought I had found people I could trust.
That whole ordeal left me rather bitter and resentful as result towards the idea of working together with anyone or giving them direct access to something I have put my time into, it broke me inside, and made me hold tight leash on anything I do in its aftermath.