Would it be more accurate to compare Google App Engine (PaaS) to Azure Web Apps or App Service (also PaaS)? Docker is in a weird spot of not really being PaaS

Would it be more accurate to compare Google App Engine (PaaS) to Azure Web Apps or App Service (also PaaS)? Docker is in a weird spot of not really being PaaS but yet too light to be considered IaaS... I tend to think of it as sufficiently PaaS-like except it runs on everyone's cloud as well as my laptop.