It seems to me that there has been a lot of success in recommendation engines (i.e. Spotify, the "Netflix Algorithm", etc). Maybe not so much on a smaller scale, but large companies are using recommendation engines all the time to keep user's engaged.
Other than that, I agree with the rest of the post. The eagerness to throw ML at any and everything can be kind of exhausting. When used right, it can be super powerful but sometimes a simpler method that achieves 80% of the results may be enough for certain use cases.