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[Epic] The Hunter - Call of the Wild (100%/Free)
(store.epicgames.com)
It's not the first time that a game is a freebie for a second time. You can see the history of free games here: https://www.pcgamer.com/epic-games-store-free-games-list/
The Hunter: Call of the Wild was also free previously, around December 2021.
It's also not the first time that a free game is "given away", but usually it means that it's some in-game purchase / DLC that is free. I think that's the case with Idle Champions as well but I haven't played it to confirm !