I believe either Nev or Matthew C. said in a previous thread that they will not say publicly their (Blizzards) intentions\actions against botters and overlay (ie THUD) users as that gives them a heads up when action(s) are about to be taken. The exception to the overlay usage is ‘Discords’ which was said we are fine to use since it doesn’t read memory and the info shown is not considered an unfair advantage.
source:
For us common folk, we may never know anything other than noticing gaping holes in the leaderboard ranks of those who deservedly got hit with the ban hammer.