hmm, I do bounty campaign when I have free time so can you called me a bounty hunter? Maybe not. I only often doing signature campaign because the other like social media need report every week and you must share about project everyday. How much you get is how much you intend to do it 
If you just follow the signature gift program means you are not included in the category of gift hunters because the so-called prize hunters are people who always follow the gift program such as signature, social media, airdrop and others.