The sentence is not completed. Here is the full version.
"with this method this forum will not last long for bounty hunters."
It will be foolish to compare between cryptocurrency and a forum. Why do people join this forum? For having a discussion about bitcoin and other cryptocurrencies? OR, for having a passive income. With the merit system, bounty hunters will not be able to rank up anymore because they don't know how to contribute in a forum. On the other hand, people with real interest in this forum will definitely gain knowledge as well as share too.