Make it actually usable
After attempting to configure Yahoo address in Android app and failing CAPTCHA with totally unrecognisable bicycles once I'm told "too many attempts, try again tomorrow". WTF? Which "security genius" invented this?
92nd
ranked

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Jarda Polacek commented
Also the need to receive SMS code means that I might be cut off my e-mail. Where I am now is often bad or even no mobile reception.