I decided against the Guest Tier because I think it would be easier for people to abuse the credit system. So, I opted for the Free Trial Sign up to get them more invested in the platform. Then, they have to pay to get more credits when using their single credit for one output.
The issue I discovered was that they are able to re-sign up after using their credit and deleting themselves with the same email, but they have to confirm it all over again. This is a very tedious task to keep doing for one credit, but it is possible.
How do we block this behavior? On the back end, after they delete themselves, I can only see one sign-up, no matter how many times they do it.