This is silly. Software using cryptography has always been dual-use goods. Also, the GPLv3 license allows the user to run the program for any purpose.
It’s usually only proprietary software that issues control to what the user can do with it, and any code used to monitor what the user does, will not be tolerated by the community. You can check the Chat Control law in EU to see how well the idea of scanning attachments against blacklisted hashes, is being received. It’s not exactly hard to disable the code running the scan when the code is open. So you can’t enforce only good guys use products. You can only do stuff like ban encryption which hurts everyone, and will only result in criminals using encryption.
I’m not sure why I had a dozen notifications regarding your crusade when I logged back in, but leave me and my critique towards SimpleX etc out.