Because Zenimax have refused to provide the option to show nameplates the invisi-bot plague we're suffering continues unchecked.
Why?
Well, I just saw three invisi-bots in action but wasn't quick enough to target them in order to see their names. I eventually camped a wood node and sure enough within a short time I heard the sound of gathering and a nameplate magically appeared because my cursor was on the wood.
I thus was able to screenshot and manually enter the name on a report.
Point is, if we could display nameplates then clearly we would see those even though the RMT scum have hacked a way to make the character invisible and Zenimax seem incapable of preventing this.