I usually explain it like email, most people get it then. Doesn’t matter if you’re using @outlook.com or @gmail.com when sending an email, you can talk to users on either as long as you specify the server address (which is mandatory in email anyway).

Perhaps Eco. It’s a bit like Minecraft but much more farming, if you choose the farming profession, and no combat whatsoever. Mainly a multiplayer game through public servers but it’s doable solo as well through settings.