My discord and telegram fill up with mindless bots (or maybe real people) spamming links and 1000%+ ROI claims in order to try to get someone to click on their invite link; so that leads me to the question, do bounty programs really work?

For people who have done them for their project, do they bring in real value?  I am not talking about discord/telegram members, anyone can buy those.  I am referring to real active members that buy or contribute to the project.