Recruitment by foreign companies must require third-party participation. Offices in China are not allowed to directly recruit people who want to work abroad without permission.

Yes, there is no clear legal text on this.

Many Chinese apply for jobs in American companies through email, and if both parties reach mutual understanding, the person can come to the United States for employment.

The main issue is the signature, which is not easy to deal with. Because it takes a long time for U.S. employers to apply for h1b permission, and the other is difficult.

Recruitment can be done directly. You can also entrust third-party companies to recruit. But not required.