This is a good point. There are a lot of reasons you might get a small boost of productivity after starting a new therapy approach.

7 days isn't enough time for the vast majority of people to know whether the app is doing anything at all for them.

"Spend a week playing with something new and interesting that you might just hyperfocus on, and then impulsively pay us for a year's access because this time you won't lose interest in two months" feels laser-targeted to prey on ADHD behaviors.

Indeed, but the same could be said about therapy, or anything really. Therapists don’t charge you a year up front as far as I know.