Naming names, AWS ghosted me after a full day of interviews. Actually that entire process was a charlie foxtrot. Not that I think I earned an offer in that interview, but they didn't earn an acceptance either.
I had the same experience with Adidas in Europe. I went through 3 rounds of remote interviews, then went to Herzogenaurach for an onsite, two days, then nothing. I understand if they didn't like me or they liked someone more, but ghosting at that point makes you feel like shit.