Pancakeswap started those lotteries just a few weeks after their official and it has been around for a while. There's no way to verify the randomness except believing the words of the developers. At the end of the day, one thing about lottery still remains the same and that's the fact that it's based on luck and anyone can win ~ but only if it's truly random.
I have only one lottery from a gambling site. It wasn't that big of an amount but it was something. That was years ago and since I've participated in 100s of lotteries with no luck. I wonder how these guys get so lucky.
They may be not as lucky as they seem at the end of the day. I once participated in giveaways of a certain company, but the principle is the same as lotteries - luck, the winners were chosen randomly. And then I saw this person that has won 2 times in one month.
I was just curious, so I wrote that person, I congratulated him and said that he must be very lucky, and I've never won anything from gives, even though I participated more than 20 times already. To that, he replied that these were his 2 only wins and he's been participating every day for the past 2 years!
My point is, you only see one side of the coin: someone wins, and you assume he/she is lucky. But the fact is, that person may have tried to win for years, so they might be no luckier than you are