Because reports of abuses are being suppressed.

By the way, this is exactly what will come to pass in the U.S. in coming months, if we don't stop it.

Human Rights Watch There's a lot more in this article, I suggest reading it, if you have the attention span.

The Chinese government controls all major channels of information, such as television, radio, and print publications. Its “Great Firewall” blocks people in China from accessing information commonly available on the internet. It also imposes ideological control over the education system.

...

Authorities continued to update the country’s censorship and surveillance regime to tighten control. In February, the State Secrets Law was revised and implementing regulations were published in July, expanding the law’s already overly broad scope. In July, the government proposed a new national digital ID card system. The cards, which are ostensibly voluntary, would give state agencies even more ability to track people online and offline.