Isn't this just normal evolution of language? Like how terms like "uppercase" have meaning even though we don't keep letters in cases (most of us anyway!). It's not like every domain extension has to match a game genre, but if, by fluke, it became what happened for "io games" ... That's how words get their meanings. Which is a long way of saying I disagree that it's strange!
Obtuse enough not to realize that a subculture produces its own tropes. If "gg games" acquires enough of an identity, they way io has, then yes, outsiders might start referring to gg games.
