Agreed with Hector, there’s so many bad-faith or misinformed opinions around this.

They should probably be obligated to provide calibration tools. However, the risk of providing those freely is that it increases the street value for stolen devices. The fact that a stolen iPhone can’t be erased and sold is a feature many people care about. Conveniently it also helps Apple’s bottom line. Someone needs to come up with a system to allow sustainable reuse without encouraging theft.