Legitimately wondering, if not Signal what should serious activists be using? Not trying to be combative, but I've heard this talking point before in more reactionary parts of the net about the CIA "funding" Signal via the OTF - which tangentially, if you look at the rest of the projects OTF supports, it's basically every moderately-sized privacy or encryption related open source project in existence... so I'm not really convinced that is necessarily a red flag, and if it is then we're already really screwed. But then these same people typically just go on using something like Telegram which is... definitely not better. lol
It is hard enough to convince most people to use Signal which has relatively good adoption and name recognition, so it puts privacy conscious people in an awkward position when we have to almost every 6 months say to our contacts, "hey bro so please try out this new shiny chat app bro, it's actually really secure this time I promise bro. please bro"
Somehow I knew this was about PSL even before clicking the spoiler text lol. The fact that you can seemingly only apply to join via Google forms gave me pause, and is the main reason I have not bothered getting involved.