I used to trust these sites, and have participated in more than 50 airdrops from them. But to be honest, I only received 2-3 good airdrops and paid. So do your own research, never trust other people reseach and websites like that.
My statistic is similar, I participated in more than 100 airdrops until now, and maybe just from you I earned more than $20, all others were under a dollar and some you couldn't even sell, they just bother me in my wallet, I should make a new wallet just do not see all those worthless tokens! I don't participate in airdrops anymore, it's a waste of time!