I am somewhat amazed how you can manufacture such expensive high tech equipment yet are too cheap to setup a proper download service for the software, which would be very simple and cheap compared to making the hardware itself.
Maybe it is a Chinese mentality thing where the first question is always "What is the absolutely cheapest way to do this?" and all other concerns are secondary at best.
..which does not inspire confidence in the hardware either.
Maybe Chinese customers are different, see this, and think "These people are smart! Why pay more if you don't have to!".
My company hosts our docker images on quay.io and docker hub, but we also have a tarball of images that we post to our Github releases. Recently our release tooling had a glitch and didn't upload the tarballs, and we very quickly got Github issues opened about it from a user who isn't able to access either docker registry and has to download the tarball from Github instead.
It doesn't surprise me that a lot of these companies have the same "release process" as Wii U homebrew utilities, since I can imagine there's not a lot of options unless you're pretty big and well-experienced (and fluent in English).