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Match Group owns and operates several online dating services including Tinder, Match.com, Meetic, OkCupid, Hinge, and PlentyOfFish.

are all of those used? I'm not American, but here tinder seems to be the only option whatsoever (aside of the lgtb alternatives).

Yes. People tend to be on multiple platforms simultaneously.

They all appeal to slightly different types of users. Like the same company selling different brands of chips.