This might be something of interest, Valve was recently caught banning accounts on Steam from their Source-based games through GNU/Linux usernames and hostnames (not Steam usernames). This began an uproar on GitHub (https://archive.is/h1wVs), where a Valve employee accidentally confirmed this to a group of cheaters who originally found the horrid and very broken method of detection.
Knowing that details about VAC should be never publicly disclosed, the damage has been done, and many news websites began to report about it (PCGamer and Polygon did a laughable bad job talking about the group of cheaters who found out the issue, as expected). Soon after, another Valve employee (that currently works with the VAC team) dismissed the company's previous words (https://archive.is/DbudG) and the ban mechanic soon vanished, two days after it has been reported.
Currently, it has been found out new VAC modules that were reporting to Valve sensible user information, such as GNU/Linux usernames, user IDs, group IDs, user working directory and shell, hostname (nodename), system name, versions of kernel and release (solid proof is present at this decompiler dump: https://archive.is/zWs22). Other than this issue, the general public now refuses to believe such thing is happening, thanks to the previous Valve employee calling it a "tactic employed by cheaters to try and sow discord and distrust among anticheat systems".
Quick tl;dr: Valve deploys a new and very false-positive mechanic for cheat detection, admits doing such, and later refuses that anything has ever happened. Later on, new VAC modules were caught snooping through system and user information without being previously disclosed, and is ignored because of general public believing on a Valve employee's words through (((Reddit))).
Is there anyway to spread even more the word about this whole happening?