Matrix was late 90's. Same people turned a 1980's graphic novel into V for Vendetta movie. They did become hacker symbols but Anonymous rode on their fame rather than other way around. Just as they rode on, but didn't contribute to, the anonymity, privacy, and Internet tech that came before The Matrix. People owe 60's-90's computer nerds and hackers way more than Anonymous. :)

Last Matrix movie came out in 2003. First real Anonymous attacks occurred in 2008.