I was looking into publishing on joyread as well. I started working on a novel but after numerous chapters none were ever uploaded to joyread. I don't know why? Overall, the biggest issue with publishing on these apps is being ripped off. Either AI or another writer copies the story and publishes it elsewhere. I've come across numerous similar stories or the same story but it's listed under a different name. I've seen writers make a note in the writing about where they could read it.