I’m surprised and happy that SUSE is still doing well. I have fond memories of using SUSE in the enterprise especially around their “perfect guest” campaign for using it in virtualized environments. I thought they had very well-baked integration with large Windows networks—things just worked out of the box that didn’t with RHEL. I’m sure a lot has changed in the last decade but I appreciated their cooperative stance in the enterprise.
Article says you cannot side load books on Apple Books. That is incorrect. You just send an epub to books via the share menu on Mac or iOS and it loads it. Also syncs it via iCloud if you want it to.
Perhaps the author meant you cannot download purchased books off of Apple Books.