I use IP addy. Users behind cgnat are already used to getting captcha the first time around There’s some stuff you can do, like creating risk scores (if a user

I use IP addy. Users behind cgnat are already used to getting captcha the first time around There’s some stuff you can do, like creating risk scores (if a user changes ip and uses the same captcha token, increase score). Many vendors do that, as does my captcha provider.