I have called and spoken to a live person on Paypal twice, and messaged them numerous times about the undesirability of Auto Login. When I speak to a person, they always deny that they turn it on. Recently, immediately after a purchase, they have begun sending me an email telling me they have turned it on and they provide a button to turn it off (They know nobody wants it on). What I do now right after purchasing something is to immediately log into my paypal account, go to Settings > Security > scroll down to Auto Login and click "Update." I make sure it's off.
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