This is erily similar to when Apple rendered thousands of iphones useless because people refused to pay their ridiculous fees or just couldn't get in with Apple.
Frankly, the manufacturer should not be crippling the device once you've bought it. You're not paying a license to operate it which can be revoked at any point, you own the device. As such, you should be able to do whatever you want with it.
I'll personally only ever go with DJI batteries but if someone else wants to go 3rd party and ruin their qc, that is their prerogative.
Just my 2c.