Many years ago I was at a black market in Beijing filled with every possible fashion counterfeit, and I found one black leather belt that had both Gucci and Calvin Klein logos on it.
It similarly seemed natural for a second ("even more fashion, right") until my brain did a double-take.
Personally, I would choose to put the Apple logo first on aesthetic grounds.
Not because I like that logo better but because it is smaller. Since English reads left to right, if the short thing comes after the long thing, it looks lopsided.
Also, since the Google logo is larger, it is going to be more prominent no matter what, so putting the Apple logo first balances that out a bit. Seems fair to me.
My guess (hope) is a group of reasonable adults talking about this collaboration (remotely) decided that the order of logos was of far less importance than them working together.
Someone probably said — “how about this?” and scribbled something. May have even been a Googler.