They still need funds from investors who are willing to buy their Bitcoin in my opinion, but if they have no money at all that's wrong. everything they do will cost money.
It's not always if they have money or not.
Honestly, bounty marketing is far less effective than traditional marketing like youtube or facebook. So they tend to spend their money on facebook ads or paying some influencers.
1 youtube influencer in my experience can be more effective than 2000 bounty hunters.