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Yes, lots of people spam HN with links promoting various off-topic sites (gambling, escort services, sports videos, etc.).

These usually get killed very quickly, and the users/sites end up getting banned by the moderators.

Yes, exactly and HN should take few more steps against it.

What additional steps would you suggest?

To send rotten fruits by mail to their business address.

There are also services that ship poop from the animal of your choice (from their catalog)

He was probably refering to automatize the removal, with crawlers or so.