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They're seemingly already doing that for benefits. I've had benefits reduced at two separate places 'because our research shows we were a little over for similar companies.' If that's not collusion, I don't know what is.

Collusion is if they, well, collude. Copying is not the same thing as colluding.

At some point copying does become tacit collusion, though.

No. Collusion requires agreement among the parties to not compete. Sure they copy but no one is forcing you to stay at the company or accept the new job offer. You walk to somewhere that does meet your ask or negotiate.

It's collision when companies agree to not compete.

https://en.wikipedia.org/wiki/Tacit_collusion

At what point does saying I am Spartacus becoming being Spartacus?

If you say “I want a raise because people in the same position at other companies make more money” is that collusion too?

The tech companies already got punished for salary collusion and it didn't really change anything.

That would be nice. It's such an easy defense for companies to say: this is what the market pays.