Manufacturers don't warranty guns that are loaded up with remanufactured, reloaded rounds either.
As I'm sure you're aware, that has to do with liability and insurance, NOT with the overall relative "safety" of factory first ammunition compared to reloaded ammunition.
I'd venture there are probably the same number of "kabooms" with reloads as there are with factory ammo...the difference is the gun company's insurance ability to chase settlement money and liability with a major manufacturer.
Ammo manufacturers also do not recommend reloading their brass for the same reasons.
And yet, hundreds of thousands -- millions? -- of people have reloaded and used reloaded ammunition completely safety for as long as the metallic cartridge has been in existence.