I do remember legitimately playing like this. Sounds dumb to some I'm sure but it was somewhat thrilling to try and stay off the radar. I remember with a friend joining a hugely turfed up server and building a secret underground base there. We went to great lengths to get grass there and a few sheep, and built a life hidden away from hundreds of players haha.
I have spent hours of most days since mid 2014 building in the same singleplayer creative Minecraft map, it is gigantic, filled with weird architechture, a gigantic minecrat network, a huge underground librarynth and more stuff.
This is me playing Elder Scrolls Online. I play it basically like a single player Elder Scrolls RPG, while occasionally seeing another player or teaming up with friends for a dungeon