I like the product and~already upvoted. But, there are some things you just can't skip-
1. It is still expensive for users. The money will be spent from users pocket. So, you have to think what value users are getting. How much a user would pay? approx. 1 usd for 1 text? Don't you think it still bit expensive. 9 usd you can get netflix for 1 month. so, you are offering less value to your users for 1 usd!
2. If inbox are spammed that is a creator's problem, not users. If creator wants to read msg so badly from fans, then creator should spend the money, not users. Users inbox are not spammed. you are selling creator's solution to a user. If anyone needs to pay, that should be the creator, not users.
3. Ko-fi already created more value for users. If a user pay a dollar to a creator on kofi, he can get more value than one text.
I also have recommended this product. And, I want to see a nice extraction of this idea, how do you play it! I loved your branding, you have taken care of every detailed. I do wish for a great journey for superpage!