That the powerball lottery is in no way determined randomly. "They" let it grow large enough by choosing a set of numbers not selected nationally (easy to do digitally now with super computers) and feed the balls out purposefully, all the while selectively choosing a target they are confident will not be savvy with the money long-term; if someone else has the winning numbers at the same time they eventually let them win, even better, less of a pot for them. This is why we're seeing these Billion dollar lotteries lately, when prior, the lottery rarely hit 8 digits, let alone 9.
Letting the pot grow larger means more hype, more tax dollars, and more sustainability of the lottery longterm as people continue to view it as a viable "out" of poverty. Meanwhile, not only is it mathematically unlikely you'd win normally, I'm pretty confident they're just choosing winners that have no shot of threatening "them" and their lifestyle long-term. This is why imo you hear so many sob stories of people who "lost it all" after winning the lottery, and very, very few people who have managed to live off of it longterm (there was a decent documentary on it a few years ago).
You could counter with "well then they could just choose to enrich themselves," but then that'd get to be suspicious very quickly and counterpoint to the sustainability of the lottery longterm, and, not for nothing, but the taxes are very much likely already enriching them, so.