When Oracle hired a good chunk of experienced AWS engineers to build their new cloud platform, they retained lawyers for each candidate to smooth the transition. They went in to it with their eyes open and played it safe.

It amounted to little more than lawyers talking back and forth for a little bit, and coming to an agreement about what the engineers could and couldn't work on for OCI, and for what time period. I hate to think how much it was costing both companies in terms of legal fees given how many made the jump.

I would imagine Google was doing the same thing, but presumably this time couldn't get to an agreement, or Amazon decided it was time to make some noise again (it seems to happen every year or so). Amazon never seems crazy enough to let it actually get to court and risk judgment going against them / their non-compete.