I guess the automatic demonetization stuff wasn't fully fixed in the last update from @TeamYouTubepic.twitter.com/4CXyWNcX2H
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Yeah, it's no big deal for me to be honest, its probably only a euro or so by the time it gets sorted. But I could see it really being an issue for people who rely on the income. It seems to have gotten better since the last update in fairness to them!