While the copyright holder is in the best position to enforce copyright, 3rd party license beneficiaries can sue to require that a company comply with the license - after all, what license does the company have if they aren't following one?; https://sfconservancy.org/copyleft-compliance/vizio.html
@SuperDicq@squish@miko can i really sue somebody for using software some third person wrote who didn't license 'em? i'd argue not, right? if i see somebody using, idk, a steam game without having purchased it ... even if i were a total reprobate who *wanted* to sue 'em, i'd have no "standing" to. only the game's distributor and publisher would have that imaginary "right" in the eyes of the state. and from this it follows: only midnightbsd devs can sue for unlicensed use of their software, and they don't seem very litigious to me.
@SuperDicq@squish@miko are you really arguing that not being licensed to use software means you aren't free to use it? are you arguing against... piracy?
But the fact that it is not legal, and there always remains a very small chance that someone will find and will be able to sue you and win, means that you are in fact not free, but are oppressed.