I actively avoid anything that is gamified or uses engagement tricks.

I don't mind paying a subscription, if the app provides ongoing updates or new content that I value, or I understand why it has running costs. I would prefer if the app had extension packs, like games' DLCs over a subscription. If an app has a subscription, I will immediately cancel the subscription after subscribing to avoid the recurring cost (if I forget to cancel after year or so). If I find the app valuable, I will re-subscribe as needed.