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(+1)

You get a standalone version of the game.   Under what circumstance would getting a steam Key through itch be preferable to getting the game through Steam directly?

(+2)

Many people prefer to buy via itch so they can be sure the developer is getting a the percentage they chose, rather than one imposed on them by a platform-holder. This is one of the major attractions of itch for a lot of people, including myself.