This is the reason I like ESP32 open-source wallets more. It's a bare-bones mass-produced module that can be easily inspected. Since it's a universal purpose board, its specific use can't be traced, and tampering millions of modules would imply making obvious visible changes. Ultimately they would need to weld tampered processors on all shipped modules, all over the world. The architecture of the ESP32 processor being open-source itself allows to standardize testing procedures. All of this is why I'm convinced open-source hardware and software are going to be the standard in the future, because they eliminate single-points of failure.