They never get to the lottery because they historically build their team through trades and FA signings (for the most part, I mean they haven't even picked in the first round since 2009.)
But if the ONE TIME they do get into the lottery, they get a great pick with a 6.3% chance at the number one. And Boston (their rivals and second most likely for a rigging) get a fantastic pick with an 8.8% chance. Conspiracy theorists would run wild, and you couldn't blame them.
That being said, Cleveland's got this in the bag. Kyrie-Dion-Wiggins-Thompson-Varejao
Even when the Lakers made it to the lottery in that time period, they never got higher than the tenth pick. So, it's not like they've ever been helped in the lottery before.