Vendor lock-in is a concern with cloud platforms but doesn't relate to the app in the submission.
I challenge you : give me a single product that cannot be moved away, given some (cost or time).
At the same time, I again challenge you : give me a single product that you can move between providers with no cost nor time.
To that last one, you can actually find stuff. For instance, you could setup your nginx in instances, without any kind of interactions with the hosting provider. In which case, you limit yourself with what everybody can do, leaving all opportunities to only use the base minimal.
But wait .. are you not locked-in with nginx (or to use a better example: with redis) ?
Vendor lock-in is a scam to increase your bills. Because, in itself, everything is vendor locking. And it does not matter. Think your architecture, design your code, and act when necessary.
Yes, one can migrate their entire CI/CD ecosystem, countless IAM policies across multiple AWS accounts in an organization, their lambdas, databases and S3 buckets over to Azure given enough time and money.
The thing is that most everything in the cloud is billed on subscription, and many core components of networked services need not be (except support). Open file server, self-hosted IAM and standards-based execution stacks. Don't like hosting your nginx on Vendor-A? Move it to Vendor-B.
Yes, the tradeoffs are costs. No, vendor "lock-in" is not the only component one should measure when deciding an architecture. Yes, "lock-in" can occur with on-prem software, and hardware, as well.
Yes, it's real and worthy of concern when a vendor knows they can squeeze you because you have no other choice and the level of effort to migrate is too high.
No, it can't be. Stop with the pseudo intellectual linkedin lingo please.
15 years ago I worked an infrastructure department with 50+ employees - these days a lot of that work that we used to do back then is taken care of by AWS.
Scaling the infra to meet peak capacity (which might be two days in a year) because you can only run on hardware you have, having data centres and data centre engineers, are all costs that go away with cloud, even though you are paying more for the compute you do use.