We should be worried about locking our workflow to a specific provider. The fact a provider makes it easier or provides tools in itself isn't lock-in.

Even then we shouldn't be particularly worried. Vendor lock-in is an unusual problem; deciding to change vendor is rare and if there's a good reason to do it then it's worth spending resources. The only time it's a real problem is when you absolutely have to change and you don't have the resources to do the necessary work.