Psyonix recently announced they would no longer support MacOS and Linux in Rocket League which obviously didn't sit well with players using those systems. The developers offered refunds but it remains to be seen what will happen with microtransactions.
MacOS and Linux will no longer be supported in Rocket League, come March 2020, when the final patch for the game will be released for those operating systems. This update will disable online functionality for players there, including online multiplayer and in-game purchases. Offline play will still be possible via Local Matches and split-screen play but it's hard to imagine someone bought Rocket League for that.
Furthermore, fans started asking questions about how hard it would be to keep the support up since Rocket League updates are mostly just cosmetic and microtransaction additions, rather than core game changes. It's not excluded that Psyonix have something in store along those lines since mentioned they will "continue to upgrade Rocket League with new technologies" although such updates were not confirmed.
The developers also to the players who will be affected but as you can see from the score of the Reddit comment, the players didn't really like that option either. Some just want to play the game rather than refund it while others are raising the question of all the microtransactions on the account, which most likely cost more than the game itself.
As much as Psyonix's reputation will suffer from the decision, fans are not oblivious to the fact that Epic Games bought out the developer and removal of macOS & Linux support was one of the first things they feared.