Those are exceptions. Being able to take a screenshot simply isn't in any way comparable to silently transiting every single message through a service, with unknown management and unaudited security, with < 50 employees, and that doesn't even appear to employ a single security engineer per my skim of their linkedin page.
Being careless with your Apple ID credentials, having malware on your outdated iOS device or the computer you sync your iPhone to (note: they can sync wirelessly and in the background now, so it doesn't have to be an explicit action) can result in the same outcome - your messages silently going to an attacker.
Either way, it should be up to the user to decide what they want to do with their messages and how much security they attach to them. After all, even in case of a fully bulletproof solution that would even prevent screenshots, the user is still free to read their messages out loud in a public place or in reach of a recording device.
Also, again, Beeper Mini (different from Beeper Cloud, which is not E2E compatible) operates entirely on-device - no message data transits through Beeper's infrastructure. There's an optional cloud component to enable real-time push notifications but even in that case I believe their server merely relays data and doesn't have the decryption keys.
> Either way, it should be up to the user to decide what they want to do with their messages and how much security they attach to them.
So you agree, it's wildly unethical to use Beeper because it doesn't give all the users in the convo the right to choose the security of their messages.
It's only as unethical as someone not running the latest iOS version, not having a strong passcode on their device and a strong Apple ID password and observing proper security practices on their main computer to ensure it isn't compromised either.
Whether you consider that unethical is up to you. Most people don't know or care and everything works out anyway.
