[michaelmrose]

Presumably for the same reason they don't want someone else packaging snap for them its another party to attack in order to attack their users in a way that would destroy trust in their product given its sensitive nature.

[turminal]

I'm already trusting debian to provide the rest of the system without backdoors. Why would getting signal from somewhere else help in any way?

[michaelmrose]

It's presumably signal not trusting 97 different stores not Debian's in particular not to get compromised.