Having worked in a university web team back in the day, these user personal spaces got dropped for various reasons. Teaching staff would push back on increasing password security, so accounts got hacked continuously. People would upload malicious applications through cgi-bins and the like. Maintenance costs skyrocketed. The cost of keeping these going because of these reasons were just not justifiable anymore, and it was much easier to provide them an account on a WYSIWYG system that could be secured, patched and maintained by an external company.
With the rise of online learning portals that included these features as standard, it became less justifiable. Why pay for two products, when one would do.
They’re still going to charge app developers releasing on 3rd party app stores, so Apple will still make money through this route. https://www.theverge.com/2024/1/26/24051823/apple-third-party-app-stores-50-cent-fee