Yeah I hate to say it but in their guidelines even too much censored cursing (especially in the beginning of a video for some reason) is grounds for demonetization for some reason. 
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Replying to @LaurenzSide @TeamYouTube
The need feedback system shows what they indicated, and thet indicated "strong profanity in the beggining of the video" which I would argu isn't the case because only part of the word is being played, making them incomplete swears and more like "fa". But oh wellpic.twitter.com/1tHtSrTL3H
4 replies 1 retweet 47 likes -
Replying to @roomieofficial @TeamYouTube
No I totally understand where you're coming from as they 100% don't make it clear, but they just copy & paste their feedback. This is a screenshot of the self-certification option that makes videos have limited ads due to cursing. It matches your feedback word for word.pic.twitter.com/ydX1w21qLQ
2 replies 1 retweet 21 likes
As in, they probably thought it was borderline so just to be safe on their end they just put you into the limited ads category which is what showed up as feedback. It's SUPER annoying especially when curse words are cut out. 
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