The main problem is control ig. On Signal, someone can ask for a code or passwords to log into your account or get your data. If you have your own solution, you can have physical security keys to verify yourself, making it impossible to give anything to anyone via the internet. You can also monitor logins and make logins on new, unauthorized devices impossible.
Encrypting stuff is not really the hard part of keeping oblivious users safe. As far as that goes, they will be fine if they have people who know what they are doing use established, well audited implementations.
Signal is great if you want some privacy chatting with friends and family.
More sensitive stuff dealing with state secrets? Probably not the best option.
Im sure some homebrewed app is more secure lol
The main problem is control ig. On Signal, someone can ask for a code or passwords to log into your account or get your data. If you have your own solution, you can have physical security keys to verify yourself, making it impossible to give anything to anyone via the internet. You can also monitor logins and make logins on new, unauthorized devices impossible.
Encrypting stuff is not really the hard part of keeping oblivious users safe. As far as that goes, they will be fine if they have people who know what they are doing use established, well audited implementations.