This whole post is utterly useless. And there are millions of them!
I might be wrong here, but I think those "proof of authentication" post are seen as similar to the signature campaign applications so that might be the reason why they don't get deleted even if you report them. And I don't think that bounty hunters get any tokens in exchange for writing them so it can't be seen as breaking the rule about incentivizing posting.
Insisting on useless bounty reports posts, they actually stimulate further spam. and I'm almost sure that none of the managers checks every report and every link posted.
Imho, the main reason why bounty managers still stick to bounty reports inside bounty topics instead doing it via Google form is because that way their bounty campaign gets bumped to the topic, making it visible to other bounty hunters. I mean, that seems like the only logical reason to still insist on them because Google form makes way more sense if you want to make your job as easy as possible.
The main problem why it's spam because there's no limit for the participants, maybe in the future theymos would add restrictions to force at least Member rank to join or have specific maximum participants.
Not gonna happen as theymos is not a fan of any type of newbie jail. After all, why should forum staff even have to deal with that, it should be bounty manager's job to sort it out.