It does matter, since the license of the fork you can make has a huge effect on the long-term sustainability of that fork.

If Unreal screws you, then you can fork it to build some features you need for your current project. If Godot screws you, then you can fork it to build some features you need for your current project, cooperate with others on the features they need which also help you, and start a community for Engine-formerly-known-as-Godot-v2 and invest in it as a thriving basis for projects 10 years down the road.