At least with PC I have the actual files for the game I am playing, and can backup and mod them as I wish.
I see playing a game like Rocket League more in lines of having a membership to club to play a certain game rather than owning a copy of the game to play alone, forever. The club will eventually go away, that's just the nature of such things.
I do agree its a good lesson to teach your kids about the limits and issues of digital "ownership" though.