Many companies (especially tech and finance) have a hiring freeze but most are still taking on new grads. So the market is worse for experienced workers.
I’ve heard that many of these are simply old postings that haven’t been taken down. The few active ones are for critical areas. I’m referring to experienced roles.
There are also some unscrupulous firms that post fake job openings (a more recent trend). This is to a) provide an impression that the company is continuing to grow and b) make overburdened employees feel that more help is on the way.
All such jobs (old inactive ones and the fake ones) are what HR professionals are calling ghost jobs. Apply, and you never get a response.