Anyone who spent time in Second Life would know that user-generated worlds are terrible for graphical performance, because people want to stick in as much content as possible and don’t approach it in the same methodical way as a game designer would.

So in SL that gets you sims with 3 fps on a good graphics card, and people who are greyed out because their clothing complexity exceeds your graphics limits. Now imagine wearing that 3fps glitchiness in a VR headset.

Trains but without having to sit next to people who aren’t your staff.

if you use more than one computer, watch out that you can’t play the same savegame on both

It might also be people who want to log in to their computer with a local account, given the problems with letting a US company decide who can use your computer and who can access your files.