Ive been into airdrops before and bounty campaign. I could say is before only few are joining the airdrops unlike now that dozens of people are lining up to join it which reduces the reward significantly. Also the value of airdrop before somehow considerable and huge but now its different too. Maybe not enough for a gas usage when you try to sell.

Also some projects are linked with scammers and only trying to use participants as a tool for marketing to execute a huge scheme.