I remember seeing a talk by a Netflix engineer (can't find it unfortunately) where he talked about multi-cloud strategies and how they aimed towards decoupling

I remember seeing a talk by a Netflix engineer (can't find it unfortunately) where he talked about multi-cloud strategies and how they aimed towards decoupling some of the components of his project from implementation details specific to AWS. So it's quite possible they're already slowly paving the way towards becoming a cloud-agnostic or multi-cloud platform. Not to say that it wouldn't still be a huge undertaking, but I don't think this never crossed their minds before.