No particular reason, depends on the use case. Every choice has tradeoffs, and there are cloud-specific ones that can hinder mobility even if it uses a common tech. Lock in is about more than code reuse especially as dependence grows. Granted, for many use cases it might be the best option, but we shouldn't pretend like it's the exact same mobility profile as copying a DB file.
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No particular reason, depends on the use case. Every choice has tradeoffs, and there are cloud-specific ones that can hinder mobility even if it uses a common tech. Lock in is about more than code reuse especially as dependence grows. Granted, for many use cases it might be the best option, but we shouldn't pretend like it's the exact same mobility profile as copying a DB file.