Earlier quoted context omitted.
Based on App Store downloads on both platforms, they are well over 200M at this point.
A lot of people, myself included, have it installed but never use it after they dropped SMS support. Only a tiny fraction of my contacts use Signal, and most of those are also on Whatsapp, Telegram, Discord, and others. Signal offers essentially nothing to me.
Many of my family also dropped Signal.
It is now really only used by the hyper-privacy conscious.