Are you using a self hosted GitLab? I feel that GitLab would have the exact same issues that GitHub has. The TOS are just clarifying what is required to run a cloud source code repository. If they want to do things like index the code, run tests on it, fork it to other users, show it on their website, then they need certain permissions from the copyright holders of the code. These permissions are not special to github I don't feel. Anyone with the same set of features would require the same permissions.
The contract states that I have to effectively grant them a BSD license for whatever I do there. Then open source licenses can stack on others' as I choose.
Nah. Not worth it. If I want it as GPL3, I expect them to comply with GPL3.
