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Adding in a query param to bust the cache make it possible to submit the same site multiple times, i.e. example.com, example.com?1, example.com?a, example.com?123

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Yes, it does, but I think there is almost no way around that. Many sites still use query parameters to show a specific blog entry for example... :/

Their server could trivially query the url and store the result hash. This would also give a chance to scan for malicious content

> Their server could trivially query the url and store the result hash.

I'm not sure what you mean here? I've not seen a site tell you "We don't use this query parameter" if you stick an additional param on there.

I think the idea is to detect when different URLs contain the same content. That defends against duplicate entries like example.com/?foo and example.com/?bar (which are the same page).

Fetch the page, hash the contents, compare hashes.

On the other hand the Link I submitted wouldn't have shown the desired result without the query string.

You probably want to allow repeats of domains, Like map links to something interesting.

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