From the photos these tracked vehicles do not look to be super disposable like a fpv drone. They're certainly more disposable than a piece of armor with lives at risk inside. Ukraine has been using very similar un-gunned ones to help retrieve wounded soldiers without risking another casualty.
Although I'd expect there'd be a place for much smaller ground drones used much like fpv drones.
BTW, back in the 80s I got a chance to drive a full-sized jeep via remote control (they were looking to see how well a pilot could do with mixed visual inputs (high res and low-but-color). I could drive around obstacles w/o problem, but as there was no seat-of-the-pants I couldn't tell if the tires were about to break adhesion. Very long story. I was a civilian, wasn't really supposed to be there (but I did have the right clearances), but everybody involved is long retired.
Anyway, that was wireless. Fiber optic has a lot more bandwidth - even if you're comparing to a situation in which you don't have an opponent trying to jam your signal. You could feasably have multiple separate video feeds and camera tracking for multiple people, so you could make use of an already battle-savvy tank crew.
As far as the Russians capturing one and reverse-engineering it, consider how well this fits their combat doctrine. This is a way to spend money so as to not risk your guys lives - the russians won't spend the money. Sort of the same reason the roman empire never came up with wind or water powered grain mills: every household had slaves to run the hand-powered household mill. There's a bit more to it than that, but still...