I'm sure if you already have a Zoom account (I don't) and you want to play D&D (I don't) and you don't mind switching between two apps (I'd prefer not to), then I guess there is no benefit...
Doesn't sound like camouflage, sounds like an illusion to me. How can 'smooth layer of unworked stone' give rise to spikes?
Camouflage implies that they're there in all their glory but disguised/hidden.
It doesn't specifically say that it can't be used indoors, however "the ground is camouflaged to look natural". How can a flagstone floor be camouflaged in this way?