I will sign up for subscription services fully well intentioned and then proceed to not use the service and forget to cancel it in time. I know myself well enough now to stay away from any product offering a subscription. There is no real “managing” it, it’s just a fact of life for me and something I live around.
An app targeting ADHD minds and not offering alternative payment options is arguably more predatory than the average free-to-play mobile app, as the founders of this app presumably know about the difficulties that ADHD cause and are either willingly ignoring it or actively exploiting it.
Even if it’s a honest accident, it leaves a bad enough taste in my mouth to stay far away.