I sure don't want to answer the question for the guy but as a response to your chain of comments, first let's get it straight that telegram is not E2EE everywh

I sure don't want to answer the question for the guy but as a response to your chain of comments, first let's get it straight that telegram is not E2EE everywhere, it is only E2EE in secret chats. Also it is not entirely proprietary, most of the client's code is open source which is a huge bonus when you know that only your messages are not super private and not all of the data on your phone or computer. Having Facebook owned crap in the same sentence as telegram is doing telegram dirty, telegram has shown that they stand up for censorship and the program provides a pretty basic privacy level that i think should be the absolute minimum. Whatsapp on the other hand is facebook owned and we all know what that means so no need to elaborate. E2EE is not everything, it doesn't mean that your conversation are private. Even if you can prove that the proprietary app uses E2EE (Discord said they did use it for voice calls but then they posted charts of what people talked about...) there is the metadata part which is still super goddamn important. Knowing: (who talks to who, when and where, with what device...etc) is still super effective to fuck someone over. Lastly, there shouldn't be any privacy guarantee with proprietary apps because you can never know what the app will do, you can make speculations based on intercepting network packets and looking at system logs on it accessing memory places and stuff. But there is always the nice surprise of it doing not what it is supposed to do which is considered by all means malware. Remember even on a pixel with Graphene OS Proprietary apps can still use super sonic tracking if worse comes to worse for them.