Maybe not for rust, but for COD there were a bunch of false vac bans that valve later rolled back
We're talking about Rust, don't drag unrelated shit into this to muddy the issue.
For the for the first three weeks, Rust warned everyone that VAC was enabled. And people complained when hacks came out and people started using them and did not immediately get banned.
People began posting complaints that "VAC was not turned on" and that garry had been lying the whole time and the warning was just a scare tactic hoping that nobody would cheat.
And then several hundred VAC bans went out. And all of a sudden the Rust subforum was flooded with lots of newly-registered accounts claiming they were wrongly VAC-banned. This is a very common tactic, and a well-known pay-for-hacks forum (AA, I'm not spelling out the full name because it's also their URL) explicitly told its customers to claim innocence and cry false-positive in a thread personally observed by Rust developers before its existence was made public and the AA mods deleted it.
THEY ARE CHEATERS. STOP TALKING ABOUT FALSE POSITIVES AND RUST.