Do you have auditable objective evidence demonstrating that that is fact, or is it speculation?
I was for 35 years a fully trained and qualified professionally-Certified Engineering Technologist (now retired), employed as a procurement quality assurance auditor, performing technical quality audits on a wide variety of equipment, and formal ISO 9000 Quality Management System audits. I have encountered many horrifying problems. Rule number one was "never assume anything".
Those who are considering the use of aftermarket chargers for their device(s) might find the series of Youtube videos by Clive Mitchel to be quite informative. I understand him to be a qualified British journeyman electrician with many years of industrial experience. He performs on-screen technical tear-downs of electrical devices (including retail USB chargers), shows how they are built, and discusses the safety significance of his findings. Many of the aftermarket devices that he has taken apart on-screen were of shockingly-dangerous construction.
Clive Mitchell's channel: