To prevent e-waste, Apple should be legally obliged to unlock the bootloader of devices once they declare them obsolete.

https://support.apple.com/en-us/102772#ipadobsolete

Yes so many iPads that are dead bricks, while they could be running some pure Linux distro for many purposes

I think this should extend to all device manufacturers. I have a few android devices that can be renewed with Lineage OS

To prevent anti-competitive behavior (illegal tying/bundling), Apple should be legally obligated to unlock the bootloader of devices once they are offered for sale.