There are ways around some of the issues there, such as using the GitHub API (I almost exclusively use the API), and/or using a user script (see below). Furthermore, on GitHub and on some other version control hosting services (such as GitLab), you can change "blob" to "raw" in the URL to access the raw files. However, as they say, it can be mirrored on multiple services (including self-hosting), and this would be a good idea, whether or not you use GitHub, so if you do not like GitHub then you do not have to use it.

Note that for some of the web pages on GitHub, the data is included as JSON data within the HTML file, although this schema is undocumented and sometimes changes. User scripts (which you might have to maintain due to these changes) can be used to display the data without any additional downloads from the server, and they can be much shorter and faster than GitHub's proprietary scripts.

Using a GPG key to sign the web page and releases is helpful (for the reasons they explain there), although there are some other things that might additionally help (if the conspiracy was not making it difficult to do these things with X.509 certificates in many ways).