If I may. This is something we’ve been discussing as well. The source of all this information was the old website which had a little bit different structure. I tried to unify things a bit, but I knew that we’ll have to go through again.
Just for a context - some of the services have just /download page with OS auto detect. Some have dedicated pages for each platform. And some have different sources for one platform (Google Play, F-Droid, APK download, GitHub, etc.).
I didn’t want to link directly the files, because it could look sketchy if suddenly some file starts downloading from somewhere.
It’s on my TODO list 
If you have some suggestion, feel free to share.