You should have taken part in DEEP onion during 2017 and 2018, for a free airdrop token it quickly rose over $1 in value and went on to record an ATH of around $17. If you had sold at the right time you made quite a profit so there are some good opportunities around even with free coins.
It's a hundred to one and you are in luck if you find a good bounty which made you a big profit, the only profitable airdrop I got into is ebtc where I made over $100 but apart from that all the over hundred airdrops I've participated in are useless and if there is value it's not even over worth $5.