Do like that EU Duel tournament server and make it where your servers kick/ban people from the server if they have autoblock or cheats.
As someone who's dueled pretty much everyone in the competitive NA community (and been accused multiple times of having autoblock huehue), I can confidently say no one uses autoblock and it's really just something that's thrown around either as a meme or when someone is salty, so it would be a very pointless counter measure.
Godfried, I have tested with a member of the 53e who used autoblock on my server, his server, NA groupfighting, and some others.
A member in my regiment has been caught using autoblocks and has been banned from
any competitive gameplay.
Unfortunately, there
is autoblock and there have been thousands of downloads for it.