I've used Aimex for awhile, I did get one shadowban. I play pretty legit in general, but one day I ran Kar98 (i usually would only run AR's with it) with aim bone on head and I dunno, I must not have looked that legit that day lol. Logged in 2 days later to 300+ms ping every time I tried to queue a lobby. About a week later I was fine. From what I've seen, I honestly don't think shadowbans have anything to do with the cheat, and everything to do with how the player uses it and the reports they generate.
Which makes me really curious about the people who I see raging and how long their stat tracking goes back of raging lol. The game I think I got SB'd for was like, 14 kills, I'm not out tracking down everyone on the map and murder botting them lol.