I get that part, but I don't see why they are encrypting it in the first place. It's being sent over SSL, so why bother? Plus, hybrid cryptosystems exist becau

I get that part, but I don't see why they are encrypting it in the first place. It's being sent over SSL, so why bother? Plus, hybrid cryptosystems exist because symmetric encryption is much faster than asymmetric, which matters for large amounts of data. But this is (even before compression) probably only about a kilobyte of data. Why have the extra complexity?