Let's say I have not yet had to do a full reinstall of Heroic and multiple associated games because something got unfixably (for my level of understanding) borked during an update.
Galaxy is free and not required. If it doesn't work you can download games from the website (which I consider an important feature). I'm pretty sure you don't have any rights whatsoever.
Buuut it also reinforces my point. The free open source solution works better than their in-house one.
Ok, but which? Can you sue them if Galaxy, a free tool that they provide for convenience and that isn't required for the actual service, doesn't work, or if it breaks a game? Name one thing.