The Steam model of Rocket League will also be fully supported from lidakun's blog

The Steam model of Rocket League will also be fully supported moving forward, so in case you don’t need to make the leap to Rocket League Items the Epic Games Store, you won’t want to if you already own the game. 

For new gamers on PC who need to play Rocket League, you will need to down load it at the Epic Games Store. This wasn’t a shocking flow considering Epic bought Psyonix closing May and has been slowly pushing toward this second considering doing so. Starting with getting rid of DLC from Steam last December and different, smaller modifications earlier than the unfastened-to-play release.

If you do want to swap to a brand new platform, you can link your Epic Games, Microsoft, PlayStation Network, Steam, and Nintendo bills together and choose which one is your primary account. That account can be used as your default throughout all platforms, which means you'll have get admission to LOLGA to its inventory and profile regardless of where you play.