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Not saying Joltfun is doing this, probably not, but you should be wary of other sites that sell keys or steam gifts (especially for indie games). Some of them sometimes end up selling from batches meant for reviewers or friends, or keys from other regions, and those can end up getting blacklisted later.

The safest option is to buy steam cards on Bitrefill. That way you avoid that risk, and you are also eligible for refunds to your steam wallet if you decide you don’t like the game.