That doesn't seem odd to me. Pomodoro/focus apps are a category where people start casual, but end up developing very specific desires that narrow their options

That doesn't seem odd to me. Pomodoro/focus apps are a category where people start casual, but end up developing very specific desires that narrow their options. Someone catering to that can charge a bit. Whether it's ethical for developers to cater to that kind of helpless behavior is another question.