I think it's a great idea but looking at the product I'd say that the value proposition isn't enough for anyone to buy a subscription. Maybe an ad supported website (like WebMD) that licensed professionals could check to validate their own assertions.
Also "$0.50/year per user" is actually a great amount if the site was made for a global audience.
And as an AWS cloud engineer I'm actually curious at the AWS cost breakdown. If done properly this kind of data processing and site hosting costs would be trivial.
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