Brewers roller pilot bearing

I used that same bearing in my car , long story short the bearing seized and welded its self on the end of my input shaft causing a terrible sqeal , I had to use a cut off wheel to get the rest of the bearing off, the other part is still in the crank, had to drop the bell with the trans just to get it out, never will use one of them again, back to old school bearing

and why did it seize?