lots of times you have an encrypted tunnel to facebook or your bank or whatever The other person will also have a encrypted tunnel to facebook but facebook is in the middle and can read whatever you type, modify it, do what they want.. in this case the ‘end’ of the encryption is facebook itself
this protects you from everyone else trying to spy on your messages but doesn’t protect you from facebook itself
end to end encryption you have a encrypted tunnel from you to the person you’re messaging, no one in the middle, no one else can read it, you’re protected from everyone even from facebook itself from reading, modifying, using it for AI, submitted it to the CIA, etc..
then again you’re trusting facebook to protecting you from.. facebook and they didn’t just fail to tell you they still gave themselves a backdoor or something
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