Two or three years, I think. So far the price has stayed exactly the same, they still have no ads, and they haven’t made any changes to the app to try to advertise features or anything like that. It was (and still is) a nice change from Spotify, Apple Music, and even YouTube to be honest.
My husband deals with that, and one thing that has helped him quite a bit is setting alarms. If he knows he is taking on an extended task, he will set an alarm on his phone for every hour or so. When it goes off, it distracts him from whatever he was doing and interrupts anything he is watching, so he is reminded to get back on task.
Another tool is accountability to another person. If he is having a bad focus day, he will sometimes ask me to bug him if I notice he is distracted for too long. Use this sparingly. I have been this person for a few people with ADHD, and using this too often has resulted in me being responded to like a parent asking their kid to stop playing games and eat their dinner. You don’t want to end up viewing your friends and partners as though they are an authority figure.