The AGPLv3 only requires that you make the source available, that can even be on request, that can be on a CD. You can even, to quote the AGPLv3 itself, charge for that CD "for a price no more than your reasonable cost of physically performing this conveying of source."
But that's not what's going on here. If the source is unchanged, it's perfectly valid (and often done) to just point people upstream. That is providing the source. And the code used to build their snap is available*, and you can see all it does is repackage upstream's official package.
But that's not what's going on here. If the source is unchanged, it's perfectly valid (and often done) to just point people upstream. That is providing the source. And the code used to build their snap is available*, and you can see all it does is repackage upstream's official package.
* https://github.com/snapcrafters/signal-desktop/blob/master/s...