I've worked as a consultant in this area for years with large F500 companies and not once have I heard anyone actually be concerned with the "lock in" boogeyman. There used to be a lot of concern around general trust of the cloud, which drove people to stick to on-prem servers. But "lock in", IME, is only something people fret about on HN.

What I think is happening is that companies are starting to gain more experience in the cloud and are less intimidated by it. In the past, using just one cloud was scary enough, let alone trying to use 2+ at the same time. But now, with more experience under their belt, companies are realizing that each cloud has its own advantages and disadvantages. AWS is rock solid when it comes to EC2, S3, RDS, Lambda, and some others. But if you have some teams in your company that want to use a PaaS, GCP App Engine is preferable to AWS Elastic Beanstalk. Similarly, your data science or AI/ML teams might prefer to use GCP services over AWS. Or maybe your risk management team is going the full stretch for disaster recovery and says not only do you have to be multi-region within one cloud, but you are required to be multi-cloud as well.

With companies moving this way, I think this is AWS realizing that multi-cloud is inevitable, so they might as well support it, if not embrace it.