Of their three examples -- spam detection - I would expect this behavior, all it has to go on is whether you write like a spammer. fake news detection - it do

Of their three examples -- spam detection - I would expect this behavior, all it has to go on is whether you write like a spammer. fake news detection - it doesn't know what is or isn't true, so this is spam detection again. sentiment analysis - I know this was known to be tricky, but yeah this one is a legitimate example