Care to share these alternatives ?
Within Google, either of the GCEs (https://cloud.google.com/compute/ https://cloud.google.com/container-engine/) depending on your architecture.
I'm not saying "Don't use GAE because it's expensive/google/whatever". I'm saying "Don't use GAE or anything like it".
Cloud Foundry gives you the "just push" experience for both of these (as well as vSphere, OpenStack, GCP and more to come). It's open source, with the IP owned by an independent foundation.
Disclosure: I work for Pivotal, we donate the majority of engineering on Cloud Foundry.