Why is it so troublesome for Jinan Inspur Industrial Internet Company to recruit and adjust employees?

Want to ask how Jinan Inspur Industrial Internet Company did it? The callback method of the company is as follows:

Regular large companies generally entrust professional third-party background investigation agencies to call back candidates. Background investigation companies usually call candidates to inform them that they will ring back before they start ringing back, and ask them to sign a power of attorney for ringing back. Turn around after the candidate agrees to sign the power of attorney.

At the same time, the background investigation company will ask the candidate to submit the latest and accurate personal information and the contact information of relevant referees, and make a callback on the basis of the collected candidate information.