Well, it is true but there are still some participants who join airdrops who don't know about this especially those newbies who recently join airdrops. Those are the people who will fall to this kind of trick even if we know that airdrop should be free.
Yes, its way to different in joining airdrop now. Its not guarantee that they will pay you after fulfilling a simple task they want. Sometimes they will listed in exchange but its valueless. It's now a waste of time joining airdrops. It's not the same at it is. No matter what don't give your personal information or pay them initially for fees. It will end up with nothing. I suggest to try joining campaigns or learn to trade instead.