Complex animated SVG is fun to roll until you get into the weeds of SMIL and Safari bricks your phone for missing a leading 0 on a float or some random nonsense.
It's slang; picture a literal brick (akin to a rock or stone). Your device is "bricked" if something has rendered it useless.
I've always thought the word 'bricked' as more akin to 'turning the phone into a useless brick'.