Why have some companies posted the same position online for a year and failed to recruit anyone?

A post that is not urgent. It is easy to delete a post from the website, and it is necessary to calculate the number of posts and resume downloads in a contract. After the same position is filled, if you withdraw this position and recruit again next time, you will be re-posted, and the website will count you as two positions, so some companies have been posting, but they just don't refresh, so you should also look at the freshness of the position when submitting your resume. User in job q: anonymous user.

I was chosen, but I hung up my resume in case I needed it. Q user: Mr. Lu