What percentage, Apple? 50%? 20%? 5%? 0.01%?In fact, an Apple internal analysis has found that some third-party batteries sold as new are actually secondhand
If it's a small percentage, well then people get what they pay for if they order a $10 battery.
If it's a large percentage, there's nothing Apple can do about it so the regulators need to step in. Can you buy $5 batteries for your car? No? Why? It's not an impossible problem to solve.
The wrong solution is Apple locking everything down to only work with its own parts.