If you're running an instance on your own server and not distributing binaries, you can treat the GPL like the MIT licence. The GPL's copyleft terms only kick

If you're running an instance on your own server and not distributing binaries, you can treat the GPL like the MIT licence. The GPL's copyleft terms only kick in when you redistribute the software. Allowing other people to run the software remotely doesn't count. (This is my understanding; do check for yourself.)