Like I said it can be done, Luke-Jr did it with Bitcoin.
That was actually done or just proposed?
If the former, that's completely against the fundamentals of being a decentralized currency.
A single person deciding which addresses can and can't be used defeats the whole purpose of cryptocurrencies.
It was done in one of the distros. I think it was debian. it was pulled but then added back in recently so yea there are forced blacklists in there for anyone running that distro.
It was Gentoo. And it was removed pretty soon.
And you can manually download the source yourself and build it like regular. It's only if you go through the OS that you got the forked version.