The state-backed media outlet Xinhua said these closures were meant to protect the "party's long-term hold on power, the country's long-term peace and stability, socio-economic development and the people's personal interests." Of course, it's that first part that China's officials are really concerned about. While the country has fought against porn, rumors and terrorism, a large amount of its energy has been spent on preventing residents from seeing uncensored news and communicating privately online.
Accordingly, officials added that over 10 million accounts had been suspended due to people refusing to use their real names. China had ostensibly implemented the measure to curb rumors and salty language, but it's widely believed to be an effort to silence dissent by making it easy to identify political opponents.
Like it or not, these takedowns aren't likely to relent any time soon. China has been implementing ever-stricter digital laws in recent months, and not just to suppress opposition during its National Congress this October. The government has grown increasingly nervous about the ability to elude its filters and monitoring tools, and it's not about to let a site stay up if it makes that evasion any easier.