This is normal for now because more bounties were now replaced by social mining one. In social mining it's easier to do task and less spammy.
I do not understand the social mining that you mean, because from the beginning there have been many bounties that rely on social media on each participant for promotion.
So you mean to say that we wouldn't get decent rewards doing bounty at this time because more bounty people are opt to do the social mining?
I don't think the intention is like that, because there have been many bounties that have used the services of the participants through social media.