Have you tried this on other servers? Have you gotten any issues?
The issues I can find with this is:
The server may not register your movements properly
Your wrong movements may spam console (which ultimately will lead to this being denied)
You won't be able to teleport according to their website's indication on limitations:
VR Animations are not supported. VR Players will appear as normal players.
Teleporting may not be allowed. Vivecraft will notify you if you turn on Teleport mode and the server has not indicated it is supported. Attempting to teleport in this case will result in ?rubberbanding? back to your original location.
Arrows and Projectiles will spawn at your face, not controller. Aim accordingly. Arrow velocity may also not be as expected.
The direction your player model looks will vary depending on activity and does not follow the HMD direction.
Endermen aggro will use the crosshair and not the look direction.
Creeper aggro will be normal, instead of at the reduced distance that allows roomscale fighting.
So in the end, can you tell us if you have tried this before on another survival server that does not have a Vivecraft extension? Did you notice lag, rubberbanding?