Valve has stepped up its anti-cheat measures and issued almost 95,000 bans in the last week alone.
In July 2017, we reported that on 6th July Valve banned over 40K Steam accounts for cheating, making it the single largest banhammer the company had ever deployed.
Emphasis on “had”, though.
Source: Eurogamer Valve issues 95,000 bans in just seven days