Online world with PERSISTENCE possible? (gtlf etc)

Would some kind of ‘second life’ with a better engine be possible on a server, where people could upload their own .gtlf (compatible 3d models)?

For example, could I pay for a server that was just a grid, and allow people to register and import models from their web browser and navigate that world?

I know this is kind of a vague question, but my main goal is to allow an open world type experience without needing to install something.

Thoughts appreciated.

SpatialOS is built for these kinds of things: