Rocket League has now gone free-to-play, and those who download the game from the Epic Games Store before October 23 can earn a $10 / £10 voucher. The voucher can only be used on qualifying games and add-ons priced at $14.99 / £15.99, and expires on November 1, 2020. You literally have nothing to lose, then, other than some hard drive space.
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https://www.techradar.com/news/rocket-league-is-free-from-the-epic-games-store-and-youll-get-a-dollar10-voucher-just-for-downloading-it