2 examples: World of Warcraft and Netflix.
WoW had FOSS implementations of server patches, with different success. It eventually lead to Classic Vanilla, Classic TBC (1st expansion), and soon Classic WotLK (2nd expansion). Each of these spanned ~2 years of content.
Netflix is an easy example. Together with everything else streaming services it gets pirated.
In a ways, definitely yes. But I was speaking more in terms of modifying frontends to convince providers' backends to grant stuff straight from the source, not reuploaded to a mirror.
WoW server patches and pirated backends I would count since you're getting pirated content on a mostly official frontend.
Though the argument is somewhat flimsy. Can't say I've played many games with reverse-engineered servers.