Signal grew 5x in one day[1]. A week before Musk amplified the WhatsApp story with his "Use Signal"[2] tweet. It then did the rounds on MSM. WhatsApp shoots itself in the foot (though IMO it's a blip in their stats). Parler (thankfully) has been kicked off AWS. All good news for alternative messaging technology.
https://twitter.com/signalapp/status/1349577579091566592
https://twitter.com/elonmusk/status/1347165127036977153
edit: as daniel_sk points out this is not a x5 increase but crossing the threshold from 10+ to the next 50+ mm downloads.