Normally the store you buy it through has no effect on the people you play with. Steam/Epic/uPlay/Whatever all connect to the same game servers (different than the servers you download the game from) to pair players together. This usually *isn’t* true when it comes to consoles vs PC, there are some exceptions I believe.
That said the main differences between PC online game stores is the deals they may offer, the social features of the store itself, the DRM implemented in that store, etc.
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