This is really an oversimplification. MS and Oracle have licensing that's explicit in the way that it wants to lock you in, although in different ways. AWS and

This is really an oversimplification. MS and Oracle have licensing that's explicit in the way that it wants to lock you in, although in different ways. AWS and GCP posting public pricing that can apply all the way until you reach an absurd spend goes a long way, and the ability to turn off a workload tomorrow incentivizes these platforms to provide a high quality of service. When working at AWS, a large part of the convincing for an MS shop would be around showing that we can offer a lower price than the 'discounting' that MS provides. Oracle was all about contract expiry. While there's some complexity around migrating a workload, regardless of where it's at, many places are going into cloud migrations hoping to remain relatively platform agnostic. I've seen many successful migrations to and from different vendors, and often at an SMB or ME scale, in weeks not years.