I follow usually see telegram groups that actually provide accurate information. i did a small stage before going in to check it out. I usually monitor it from The Airdrop Detective telegram group. Maybe the prize is small, but if it's proven to be paid, I don't think there's anything wrong with joining and participating. For others, more in-depth research is needed. 
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Airdrops is just shit right now. Last a year i participated in many airdrops campaigns but i didn’t get penny because of SCAM. Your mentioned Detective team is so professional, because their mostly conducted bounty project paid out in time also their airdrops because they launched only promising project. .