There is a feature on the site that can detect if people are logging onto other people's accounts, or if they have multiple accounts, and the rednoses are automated. There are ways people have been avoiding them, such as using incognito or VPNs, but now that we have moderation, there must have been an update to the red nose system for people to still get the noses even if they used a loophole when account sharing.
It's a stigma, if you have one, everyone knows you let someone on your account/went on someone else's
