YouTube mistakenly bans accounts & removes channels for 'spam'

Over the past few hours, YouTube appears to have accidentally removed channels and banned accounts for violating its "spam, deceptive practices, and scams policy" even for users that have never uploaded videos in what looks to be a bug. YouTube has acknowledged the issue is "actively working on reinstating the channels." These non-content creators have lost access to their YouTube account and cannot watch videos or listen to YouTube Music.