some airdrop still worthed to participate especially retroactive airdrop that specialized for early user in certain platform. If we just join airdrop program with filtering i am believe we will get nothing or maybe only waste or time. Most airdrop program use FCFS scheme which make us has low probability to win. Just like bounty campaign, we should screen it to find the best one.
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Retroactive, which I also want to talk about, this is a more practical form of spamming through simple tasks performing tasks on telegram  or tasks through social networks. In order to receive the rewards, users need to participate in the early testing of the project before they release the official product, participants will have to use the product to experience and contribute ideas to help developers improve their products. The most active contributors will receive a reward commensurate with their contribution. This method is very good and requires us to be serious in our work to expect to receive a worthy reward.