That begs the question then, why are milder cams failing, because apparently that's an issue as well. Uncle Tony just did a video yesterday where he references the video above and says to check every cam and lifter before installation.
I'm inclined to believe that there's a shortage of people technically competent enough to do a thorough QA analysis, and there's a shortage of upper management willing to accept that good QA is necessary for long term profitability. People are too willing to buy eBay cams and the manufacturers are trying to compete. On the flip side, when talking about performance products other than cams, companies like Professional Products and Assault Racing are giving 95% of the performance for 1/2 the price, partly by a lack of robust QA. Capitalism. The market is currently in turmoil and at some point we'll find which manufacturer still makes reliable flat tappet cams.
Full disclosure - I have a $50 flat tappet cam in one of my engines, but having learned so much in the last year, I plan on sticking with name brand rollers in the future.