While it is not a popular opinion here, becoming a JW is a voluntary association. The government in power where we live is not a voluntary association. "Big Brother" is a reference to governmental power derived from the novel 1984. It doesn't fit Jehovah's Witnesses.
Probably a more accurate description of Witness practice is that it is intrusive and high control.
You didn't need me to be pedantic, did you? But I couldn't resist.