Exactly. It is for 'everyone'. Including criminals, gangsters, money launderers like SBF and those using Signal's encrypted cryptocurrency wallet (MobileCoin), terrorists and illegal drug traffickers.
If Microsoft, Google, and Amazon wanted to, they could just refuse service to Signal due to this and cut them off their services for facilitating that since they are centrally using their services.
If they can do it to Parler, they can also do it to Signal as well. Easy.
I too am a moral narcissist that loves when massive corporations project their power outside the market to coerce people into certain behaviors. I can't possibly imagine that ever backfiring.
Why are people so focused on the "messaging" aspect of crime? You don't hear them calling for anything else to be cancelled that allows criminals to be criminals. Window shades give criminals privacy too, but nobody's is calling for the cancelling of window shades.
I would guess because law enforcement can go into your house and peek at whatever it is you’re hiding behind the curtains but encrypted messages prevent this.
If Microsoft, Google, and Amazon wanted to, they could just refuse service to Signal due to this and cut them off their services for facilitating that since they are centrally using their services.
If they can do it to Parler, they can also do it to Signal as well. Easy.