It's difficult to find another effective marketing because people also difficult to find profitable token/altcoin where there are many new project also occur nowadays.
Overall it's depend on themself !
They can lock the coins as they think it would be a risk that would dump the price.
But that is not transparent, during the start, they were able to recruit supporters through the bounty program because they have a very good rate.
But changing it afterwards, I thought it's kind of unfair practice that should not be tolerated.
I'm confronted with this problem quite often. Today, most of my crypto wallet is blocked in the form of a Bounty reward