I definitely consider the cam being made wrong as a legitimate reason for failure.
That cam also had way way too much lobe taper(which I haven’t run across myself), and didn’t have any chance of surviving.
Cams failing from inadequate lobe taper...... I see that reasonably often as a reason for a cam not surviving.
Low taper = less lifter rotation...... and if it’s being run with stiff springs, the cam/lifters don’t usually last very long.