Can't really prove that type of thing, but I'm fairly certain the V-dweebs occasionally engage in those types of shenanigans.
Of course you can't prove it because it's most likely the fantasy dreamed up like everyone else has.
I recall one time the v guys had switched to control a carrier or get it sunk - that player got pretty good amount of backlash and called out on it - I haven't seen it since.
There is spotted cases of squads using this tactic, and they get called out and busted for it, same with vulching a shade account.
The reality is most don't need "Spies" to sink a carrier, for example today I hunted down a Knight carrier on the map we have now, I was told it was just used within the hour to take a rook base and upped B-26s to sink the carrier.
I assumed someone went to take the long route hoping to keep the carrier safe so I figured within an hour it didn't move far - found it at the edge of the sector of the map, it got sunk and nothing came of it.
Most of the time the carriers stay in combat far to long, all it takes is one half decent buff driver to sink a carrier with one pass. Doesn't mean spies are needed especially when it only takes one person off a CV in the middle of an ocean with no dar around it to make it obvious.
Now I have busted one Alchemist member who rook hide a cv in the middle of no where - came to sink it from almost 9 sectors away, Fishy but no real proof since he probably used a shade account to find it.
One person in hundreds is numbers I can deal with, if it goes to dozens per hundreds then its a problem, not everyone is shameless.
As Guppy says, can we see a list of anyone caught spying? I certainly never have, how can you? You actively must tell someone you have a "Shade account" and name it - otherwise it goes unnoticed. I think if a person is abusing to often they probably would get banned by HTC, but it would be done hush hush.
