https://www.theverge.com/2019/5/1/18525842/epic-games-psyoni...
"As a result of the deal, Psyonix says it will have access to more resources to support Rocket League’s competitive e-sports league and, by late 2019, will bring the game to Epic’s PC storefront. After that, Rocket League will no longer be available on Valve’s competing Steam store, though buyers of the Steam version will continue to receive support, which Variety is reporting includes downloadable content, patches, and all other future content. Terms of the deal, including how much money Epic paid to acquire Psyonix, were not made public.
“The PC version of Rocket League will come to the Epic Games store in late 2019. In the meantime, it will continue to be available for purchase on Steam; thereafter it will continue to be supported on Steam for all existing purchasers,” reads a press release issued to media at the time of deal’s announcement."