Ghosted after being hired

I had an interview, I got the job and I filled out all the paperwork. But I still had the second part of onboarding to finish, but it was never emailed to me.

I emailed, I texted, and I called to try and get ahold of the manager that hired me. When I called, my call was forwarded to voicemail after ringing for a bit. So I know that he declined my call on purpose.

This is the second job in the past month that's ghosted me after hiring. What the hell is going on with these companies lately?