Large "private" companies in China are not private as you would think of them in the West. The Chinese government or the CCP will own outright or through holding companies shares in a company. So even at the most benign the government or CCP will have influence in a company's governance. Executives and upper management will always be outwardly enthusiastic about all Chinese government/CCP talking points and decisions.

Due to China's "security" laws security and intelligence agencies have essentially full access to large companies' data. There's no real due process so a "private" company's data is essentially government data. There's also the overt and covert censorship and propaganda imposed by the government.

Company executives serve at the pleasure of the government. Anyone not towing the party line or acting with too much independence will get caught up in "anti-corruption" investigations or just be arrested for crimes they may or may not have actually committed.

Realistically it's better to just assume a priori that a Chinese social media company is pushing propaganda and building dossiers of users. It's certainly safer to assume that.