Do Paid AI Writing Apps really work?

My FB feed is overflowing with advertisements for student writing assistant AI from various companies. I am wondering if these apps are useful to students? I mean personally, I would rather hire a human writer, then AI the heck out of that, even though that method has limitations. I've already paid for the use of 2 writing apps because I am dissatisfied with their products.

The AI writing app also has additional costs. Once you pay for the basic service, the app tries to get you to subscribe to additional services. Which I hate because I paid for the app already, why do I need to pay extra? Shouldn't those come with the service? Also, why doesn't the AI app come with revision options? The work that is produced needs improvement every time, and I have to do it myself.

Am I wasting my time paying for these writing apps just so I can test it till I find the right one?

You're probably wasting your time. The same AI that writes your paper can now detect their own writing, so students are not safe if they think they can get away with robot research. In addition, all generated output / papers are now saved in databases and can easily be checked against submitted academic papers by AI anti-plagiarism tools.