Modern satellites are protected by various means of encryption, but there’s an enthusiast community that tracks down and communicates with very old unencrypted zombie satellites. There’s even been an NGO which managed to fire rockets on an abandoned NASA/ESA probe (with their approval.)
The Voyagers benefits primarily from the lack of groups with an adequate deep space network to communicate with it. Their communication standards are otherwise completely open and well documented.
Reminds me of when a recent sci-fi author wrote a first person novel with an androgynously named protagonist. They didn’t ever directly refer or allude to the character’s sex in the novel. Fan communities and book clubs spent months realizing they’d subconsciously given the protagonist pronouns in their head. (It’s less awkward than it sounds due to the sci-fi premise.) The author only addressed it months after it came out. They got both Wil Wheaton and Amber Benson to create identical audiobooks for the sequel.