After setting up a Gmail account in the mid-aughts, Mark, who is in his 40s, came to rely heavily on Google. He synced appointments with his wife on Google Calendar. His Android smartphone camera backed up his photos and videos to the Google cloud. He even had a phone plan with Google Fi.Two days after taking the photos of his son, Mark’s phone made a blooping notification noise: His account had been disabled because of “harmful content” that was “a severe violation of Google’s policies and might be illegal.” A “learn more” link led to a list of possible reasons,...