It’s so weird that several people are asking for “actual” evidence. Of course I am not a developer at Blizz. I am not a journalist, I am not going to seek out an ex-developer to admit to manipulating drop rates. It’s anecdotally blatant to most players what I’m claiming is true.
If you want to make a company that gathers data from every person willing, you might be able to prove, through much difficulty, that a trend exists where Blizz is manipulating drop rates, then maybe you’re ready for a law degree.