I built Gaintrain (https://gaintrainapp.com/), a meal planning app designed to help users optimize their muscle gain.
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Since its launch in July, we have focused on improving retention and making the app as useful as possible. Currently, we have not actively pursued marketing efforts, but have gained users through searches on app and play stores. Recently, we introduced a paid subscription option and have already surpassed $500 in monthly revenue.
He says that the copywriter writes 1 or 2 articles every week. He gets paid an average of 100$ per article. That's' not bad if you consider that the writer, for sure, is working for other people as well.
I can understand what you say about unhappy users, they are the hardest to establish a conversation with, in fact, I had yet no luck with them.
I also try to contact my most engaged and paying users, very little luck there.
So, either everyone is laying (very unlikely), or I'm doing something wrong.