From your link: As far as I know as someone who worked here for 7+ years (take this as personal opinion), Mapbox wants to keep investing heavily in open source and open data sustainably and indefinitely, and this GL JS change is an unevitable prerequisite for that. This may not be easily apparent at this moment but it will be soon.

I guess this is what he was referring to.

Products developed at Amazon typically take more than a week from start to launch.

Not sure if you are serious but what I meant was, I wonder if Mapbox's recent shift was based on preexisting knowledge of this Amazon release.