My apologies, I was working off memory from when I first looked at it yesterday. I think that $10 per year is totally reasonable. But given the current extreme distaste for subscriptions, I think that a $40 one time perpetual license is probably going to work more in your favour.
2. Sure, I'll experiment with the Messages app to reproduce this. Thanks for pointing this out.
3. It's $10 per year and not month. There is a $40 perpetual license already on the purchase link - https://boringbar.app