STORE COMMUNITY ABOUT SUPPORT
Login Store Community Support
View desktop website
© Valve Corporation. All rights reserved. All trademarks are property of their respective owners in the US and other countries.
It looks like the ReShade based zoom hack is based on a custom shader to implement the zooming logic. Due to the technique, it's not really possible to block or detect just the zooming functionality of ReShade without blocking the software.
Since ReShade allows the effects to be toggled in a shortcut and also configured on the fly inside the game, ReShade could potentially be a really powerful tool for unfair advantage such as zooming or adjusting the color balance of the game. (e.g. Seeing better in dark than other players.)