Sometimes I do question this too but it's a drop or what they call a "rain" so I doubt some gamblers will create a ruckus out of it. I even question those who receive the drop, maybe because I have not experienced it yet. Questions like, they may be part of the team or dummies of the team behind the company.
But as I said, I won't waste time questioning it because they are freebies. It's like a charity that cannot be questioned by the government.
Maybe if I receive it once, I will believe it. Regarding the number of the sent rain, now that's a more difficult question and we might never know unless someone who does it will come out and share the list.
This rain that you are talking about in crypto gambling, I also experienced it once, I just can't remember the name of the casino. It's like faucets or giveaways during that time they gave something every 30 mins at those times.
But, in order for you to qualify for these drops, you must first be able to enter money into their gambling platform, and in fairness, it was pretty good by that time, but now it seems that these features have been removed from crypto gambling as I just noticed.