After I moved to Sweden I started using an app to identify plants called PictureThis. I think it might have originally been called something else.
Now, that's not even what I'd call a hobby, it's just, you know, I'm out walking and I see a flower or something and I'm like, "Hey, what's that?" So it's not something I'd want to pay a bunch of money for. Plus, every time I snap a photo of a plant, it nets them data for training their AI or whatever, for telling them exactly where which plants are growing, all that stuff, so it's not like they get nothing out of it.
Over time they have gotten more and more sleazy with the way they present the free-to-use portion of the app, moving the "tap here for the free version" bit around on the screen, trying to trick you into tapping on the giant green CONTINUE button that will start up a subscription. It's just so obviously shady.
I just loaded it up and it launches to the subscription offer page ($30/year) and up in the corner is the word cancel in a tiny white font against a light background, so that it's barely visible. And it's like, maybe if you have to trick people into buying your service, it's not worth all that much to begin with.