[2019] Do you get double elo if you beat a hacker/cheater?

Originally posted by Capta1n_PriCe: just wondering.

Here[rainbow6.ubisoft.com] is the blog post on the MMR Rollback system.
As Sybec mentioned, it essentially is supposed to wipe matches with the banned player as if they never happened. Therefore, any MMR you gained or lost was reversed. For some players, the amount they lost may have been less than the amount they gained by playing against a banned player.