PII, PHI, classified data, controlled unclassified information, proprietary trade secrets, a requirement to host user data in the country the user lives, a comp

PII, PHI, classified data, controlled unclassified information, proprietary trade secrets, a requirement to host user data in the country the user lives, a company is massive enough to own data centers and may as well use them. There are so many reasons to self-host. Unless your service is as big as AWS/Azure and can afford to build a private cloud in a location of the customer's choosing for sufficiently large customers, "only cloud" isn't good enough for many use cases. You're putting your own convenience as a developer ahead of the needs of certain users. Which is fine, I guess. You don't need to serve everyone. But you shouldn't be out there acting like self-hosting never makes sense. You may as well ask why some facilities have their own generators and their own wells and don't just universally hook into the public grids. Some applications have requirements for hard perimeters and self-reliance.