

If I understand correctly, it’s a different kind of “immutable”, since distros like Bazzite provide premade immutable images you use and anything else you need you install using alternative means, whereas NixOS is an immutable image generator that requires you to set up your own definitions for the image, but also lets you install software by adding it to that image.
You can call “bs” all you want, but you’re yelling at the messenger. If I understand the situation correctly, you’re using an Amazon service, so Amazon promoting Amazon stuff on that service might count as self-promotion (or whatever the term is) rather than advertisement. The difference being that they’re not being paid by somebody to promote their thing, and just calling out their own services/events.
Note that I’m also not supporting this, I don’t like it, but I’m also not surprised if that’s how that works, and that Amazon would be using it this way.