Snaps response [2] seems to be:
> I understand the sudden move of signal-desktop can be disruptive for people wishing to install this package. Just to confirm the reason for the absence - Snap Store administrators had to remove the snap in accordance with our policies. We hope to have it back shortly.
1. https://github.com/snapcrafters/signal-desktop/issues/70#iss...
2. https://forum.snapcraft.io/t/what-happened-to-signal-desktop...