Yes, there is truth in your statement. I agree that most of the times for example social media bounties are irrelevant. Bounty hunters buy followers and those retweets/shares are totally worthless. It is rare that someone uses his/her personal accounts and shares the posts there. On the other hand there are some bounties that are needed to get the word out to the potential investors: creative bounties and signature bounties (on Hero, Legendary rank) can have some positive effect on the marketing. And also (sadly) nowadys a big follower base is an expectation for new projects on social media, and in some cases bounties and airdrops are the only way to get the numbers.