Thanks for your edition, i updated my post to add the link.
I don't agree, with your interpretation of https://support.google.com/webmasters/answer/66356?hl=en&visit_id=636962366717273320-2046469719&rd=1
- Buying or selling links that pass PageRank. This includes exchanging money for links, or posts that contain links; exchanging goods or services for links; or sending someone a “free” product in exchange for them writing about it and including a link
To avoid risk penalty, the bounty campaign link should be nofollowed i think.
the Page Rank of Bitcointalk, is extremely high, it can afford such penalty, and still rank super well, but why not trying to do even better ?
Bitcointalk provide Free announcement opportunity for altcoin projects, it free canal of communication for the cryptosphere, I very appreciate this forum because of that.
Now-a-day you need to pay to publish on most major cryptocurrency news website...