You could say the same for Signal (before Signal Foundation was created this year) or Wire (created by the people who created Skype) too.
> Lastly, to my knowledge, end-to-end encryption is not enabled by default, neither for private messaging or groups. That's just a no-go for any chat application for me.
The “secret chats” are always end-to-end encrypted. The normal chats are encrypted only in transit and not end-to-end. But secret chats are also tied to a single device (currently only phones), unlike Wire, which offers end-to-end encryption and synchronized conversations across devices.
