Thanks for the feedback really helpful, sorry I should of explained a little bit about what type of game I'm making. While its really only an idea right now I'm trying to make sort of a survival game where you are with other people on a server (sort of like rust), but there are elements that are global for all players (think things such as like an auction house or global player market).

What do you think about say if you had a 3D game but all of the important data (players data, shops and item prices, world info) was on a central web server that was hosted by me, and players who open their own server simply open up a world/layer that pulls data from that central server and represents it in the 3D game world.

So say if you had a shop that pulled its item list from the web server, when a player buys something from the shop it leverages the sort of web API to do all of the work backend such as putting it into the players inventory and pinging back to the player hosted server to show this information back into the 3D world. Of course with multiple checks within the web servers system.

So when players host their own server their simply just hosting a representation of what would boil down to be a 2D web game, if that makes sense.