Well, if I look back from last year, I saw some airdrops that were also included in the top altcoins. And most of them have been included in the list of Binance Exchange, which is one of the most well-known top exchanges in this field.
So, my answer is that it can be airdrop season right now, which can just go along with the trend we have at the moment with the upcoming bitcoin halving and bull run after the halving this year until next year, according to my friends readable speculations.
Airdrop season has been going on for a long time but for these years I think there is an improvement from the previous year, the airdrop cycle does vary but if you pay attention to the cycle it just goes around and around and maybe for some people think this year's halving will slightly help increase the chances of success with it.