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I certainly do not have this expectation. What makes you think "people worldwide" do?

I thought .io TLD's were for the javascript framework/library of the week?

Recent html5 multi-player games have used .io e.g. slither.io

Multiplayer games do not have a monopoly on the dot IO tld. I have several for various purposes, none of which are game-related.

Why do you feel that people are primed to expect a ".io" in a gaming context to link to a multiplayer game?