Come on. If Google broke ranks and started aggressively poaching people for GCP and going after market share, Amazon would realize in about 5 seconds that it hadn't "overhired" for absurdly-profitable AWS after all.

These firms have colluded to drive down wages before (the "Techtopus" case), a fact that we know because they were stupid enough to put it in writing. This time there's no proof and may be no explicit agreement, but a tiger doesn't change their stripes.