That it's hard to get enough volunteer capacity, that exit node operators can sometimes get in trouble for things users did, that attackers can run exit nodes in order to look at traffic content, that attackers can run undisclosed families of relays in order to perform some traffic correlation attacks when a circuit uses multiple relays controlled by the same party, or that some sites may block or CAPTCHA exit nodes?
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Which exit node issue in particular?
That it's hard to get enough volunteer capacity, that exit node operators can sometimes get in trouble for things users did, that attackers can run exit nodes in order to look at traffic content, that attackers can run undisclosed families of relays in order to perform some traffic correlation attacks when a circuit uses multiple relays controlled by the same party, or that some sites may block or CAPTCHA exit nodes?