I can't remember any project distributing airdrop for completing tasks in Zeely. For completing such tasks, you can additionally get role in the Discord, but this will also not bring you financial encouragement. If you have a positive experience of participating in Zeely, tell us about such a project here.
Most of the projects using Zealy are just garbage and they ended up not paying you because they use it for free marketing scheme, I've participated in some campaigns with Zealy but I didn't do things such as post/retweet or follow the accounts project especially if it's a trash one, I only do visit the projects website and similar things like that. But as far as I know, the projects don't really care about that and not paying the hunters.