I always join in any airdrops because they give away free token although some of them dont have value and many of them are scam but now i choose to participate airdrops when I like the concepts or project.
I ma facing a lot of issues on joining Airdrops last year that is why I never join any single airdrops this year because my first myetherwallet wallet is full of shit coins and even after a long time they have no value because they are failed and never bumped coin exchanges.
I do not waste my time and efforts on joking any airdrops but instead I am joining bounty campaigns and wait for around 3 months and will soon earn price value after they hit coin exchanges.