It’s not a secret agreement. The fact that they’re effectively a duopoly (Intel I guess makes GPUs now), price gouging is as easy as copying the already successful competitor (AMD copying nVidia).
Every time a corporation or group of corporations ask for regulations to be placed on themselves, that’s a massive red flag that they are going to lobby to cut the legs off of that regulation, or they will make the regulation give them more power.
Only supported in KDE, Sway, Hyprland, and gamescope as of right now. Also supported in X11.
https://wiki.archlinux.org/title/Variable_refresh_rate