Airdrop is considerable a time wasting over a hundred of airdrops you participated? Maybe 1 or 5 airdrops are guaranteed for you to pay. Airdrop payments are ranging $1 - $5 also so and this is not a good way to earn crypto currency or Bitcoin.
for people who can't spend their time more efficiently this might be not the worst thing to do honestly
but I prefer not to do them since I can own much more with same amount of time and I don't feel like I support any good projects with my participation