- S3 has a public protocol and many 3rd party providers support it (OpenIO, Scality, Ceph, Minio, etc),
- EFS could be replaced with something like DRDB or GlusterFS, or DigitalOcean's block storage or Google Cloud's networked disks.
- ELB could be replaced easily with similar services from other providers [1] if you use Kubernetes (I don't know if all have a LoadBalancer type though)
I would be more concerned about firewall/vpc rules, because I have no idea how those could be migrated without risk of forgetting some. Lock-in seems not that high in the end though and even less so if you use an open source container orchestration stack because they abstract most of these things away.
- S3 has a public protocol and many 3rd party providers support it (OpenIO, Scality, Ceph, Minio, etc),
- EFS could be replaced with something like DRDB or GlusterFS, or DigitalOcean's block storage or Google Cloud's networked disks.
- ELB could be replaced easily with similar services from other providers [1] if you use Kubernetes (I don't know if all have a LoadBalancer type though)
I would be more concerned about firewall/vpc rules, because I have no idea how those could be migrated without risk of forgetting some. Lock-in seems not that high in the end though and even less so if you use an open source container orchestration stack because they abstract most of these things away.
[1] https://kubernetes.io/docs/tasks/access-application-cluster/...