To me, Instagram is a public platform at its core, where people publish things for the whole world to see. Private messages are just a secondary feature.
It is like having a conversation in a restaurant, where the guy at the next table can listen to everything, but usually doesn't. Good enough for planning a surprise party, not for truly sensitive information. Kind of like private messages in Reddit, Discord, etc... a convenient feature, but don't expect real privacy.
replyMessenger has a higher expectation of privacy, Facebook is more at the "group of friends" level. While Instagram is a public restaurant, Facebook is more like a house party. WhatsApp has the highest expectation of privacy as it is designed for private, often one-to-one conversations first.
Sure, but if you already have e2ee, it takes work to remove it... why invest the time to do that?
replyIt also takes work to keep it working and it may have a lot of bugs already, that are hard to fix because of it. A non-E2EE chat app is very easy to make.
replyWhatsApp and Messenger are pure messaging apps. For Instagram, DMs are just a tiny part of the overall experience.
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