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It looks to me like it violates the Show HN rules by being just a sign-up instead of something people can try out.

https://news.ycombinator.com/showhn.html

It is not. Users subscribe and they receive a mail informing them that the Scan will be launched shortly. Once the scan is over the user receive the scan report on his mailbox. This is the service we provide...

From the guidelines:

"Blog posts, sign-up pages, and fundraisers can't be tried out, so they can't be Show HNs"

The only way to try out your service is to hand over card details.

Well this is a paid service... This is not a sign up page onlt. If we follow your logic any service that require card details can't be submitted to HN.

The distinction is they aren't appropriate for "Show HN". They may be submitted as normal submissions.

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