[phy6]

It's more likely that they stand up several current versions in parallel, and progressively route more traffic to the new algorithms/services. At least that's what I'd do, if I had no technical, infrastructure or monetary budget.

[simcop2387]

I'd be surprised if that's not how they do it. Less for budgetary reasons and more for testing, doing it this way would let them see if they get the results they are after in aggregate for more useful queries