The more people that prepare for these airdrops, the smaller the rewards.
You have actually said they key point here, the more the participants the smaller the rewards, the lower the participants the higher the rewards, and this is a typical example of what happens in the Just concluded hamster Kombat token, they have the largest population in participants, and at a point, I was asking one of my guy that can this people pay? Because the numbers of people involve in that telegram tap to earn game was too much and we all knew the final outcome of how the airdrop activity played out, so in essence is that when it comes to airdrop, nothing is certain, but one thing I have observed lately about most of this airdrop is that, any of this project that will pay good money wouldn't be that stressful, but you see those dust of a project, they will certainly over work and over stress you if you are a participant of it.
Then lastly, and according to your question if their is any genuine airdrop, yes they are, but it's not written on their forehead, Blum, major, tomarket, seed, memefi and the rest, all this project I made mentioned, majority of them might be a complete waste of time, but I believe that one or two of them might comes in handy.
You can get some money doing drops even today, but it requires lots of proxies / accounts / being an influencer, etc. Otherwise, it may end up just a small prize for the big effort. 
