Most times, one cannot really point out the good airdrops from the bad ones, yes most of the times also, good and worthy airdrops asks for little info which could be just wallet address, some might go further to ask for twitter and telegram participation, and where some will be true thus paying afterwards, others will only be a means to grow social media channels.
There are some airdrops that didn't only asked for wallet address, but requested for some sort of tasks on discord and they ended up paying, and some of them, their value was very attractive, a good example is those witnessed on Solana ecosystem such as Cope, Rope and so on.
Even today, most airdrops on Solana requires users or interested people to hold some amount of Cope or Rope, and most times, the airdop ended up being worth it.
Now, I am not trying to say there are no airdrop which asks for few data and pays well, but I think the trend is changing now. Another example is, a lot of people know about dydx airdrop, where users were asked to trade, the qualified participants ended up with a very valuable token, listed on top exchanges and still maintaining a good price today. Avax ecosystem also experienced theirs, therefore, like I said, the trend is changing and one can only follow with it, you never can tell what will happen along the way.