[londons_explore]

This is correct.

Videos are demonetized mostly on a blacklist of bad words. Run text to speech on the video before upload (preferably upload the audio only on a test channel and download the captions), and edit out all words which have any negative connotation whatsoever.

Beware - the blacklist contains a lot of words which are only bad in a certain language or a certain region or slang you might be unaware of. Use urban dictionary to find the bad words... It seems you can let a few slip through, but if a bad word appears too many times, it causes demonetization.

[wybiral]

That seems like an absurd step to require for every upload. Their algorithm should really give me the benefit of the doubt after having required manual review dozens of times and always having my content remonetized.