Neko ni Tenseishita kedo Hima nano de Geema Joshi to Issho ni VRMMO wo suru - Vol. 1 Ch. 3 - Cat acquires shaman arts?

[Pokari]

I feel like knowing who's a real person is actually kind of important for reasons and hiding it would be a really bad idea.

For instance, you're inevitably going to get players being awful to other players that they misunderstood to be NPCs. Even if ignoring the potential ethics problems for their own sake, no sane company would want to embroil themselves in the legal implications arising from situations like, "a player sexually harassed another player that they thought was a robot".