Hello,
I suggest you to check this blog post: https://devblog.dualthegame.com/2014/09/26/a-single-shard-continuous-universe-one-world-no-boundaries/ (from 2014 already)
... and this youtube demo: https://www.youtube.com/watch?v=QeZtqoydXpc
They both explain how NQ developed single shard technology.
Also note that Dual Universe is PvP oriented. There is no creative mode.
PS: As Tsyolin uses EvE as a reference to raise specific concerns, I think it fits well here.
~ Merwyn