As far as I understand earlier airdrops were good but now the number of good projects is very less. Most people don't trust airdrops to be scams. Airdrops are working but not paying. That's why the number of participants has decreased a lot. Those associated with project team managers may be making money.
There are quite a lot of good projects, but those that pay the community the proper rewards are very rare to find. Sometimes projects that are already good and listed on Exchange Tier 1 actually provide small rewards for the community or unfair distribution. this will raise the ire of the community and the project will forever be marked as a fraud.