Anticheat software like EAC (as well as commercial antiviruses and malicious rootkits) often reverse-engineer internal system data structures and call undocumen

Anticheat software like EAC (as well as commercial antiviruses and malicious rootkits) often reverse-engineer internal system data structures and call undocumented functions. You really can't blame system library developers for breaking compatibility with software that is doing things "the wrong way." Yes, I know Linus Torvalds says "don't break userspace," but that's for officially exposed kernel interfaces.