Wow man - Sorry you had such bad time :-/ Hopefully you got something fun now :-)
I have noticed over the years that interviewing has gotten more onerous and ghosting has gotten more common. There's never any reason to treat people badly/ghost them. Even a thanks-but-no-thanks is better then radio silence.
My employees were close to my age, and got jobs, but it took years. These were top-shelf C++ geeks.
I was treated pretty badly, and decided it wasn’t worth it.