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If you really care about security, it would make sense to 'zero-out' or shred the drives rather than leaving them with Apple's recovery tools and the previous owner's files. Doing this is simple, just live-boot a Unix of your choice, run something like `cat /dev/random | dd -o /dev/nvme0` or the `shred` utility. This process will take a while (especially for larger disks) but if you run them all in parallel then it shouldn't take long.

I've never done this personally, but I believe Apple's Disk Utility has a function to zero out drives. In theory, if you boot into Recovery Mode (Which, IIRC, was Command+R or holding the power button on ARM machines), you can access the utility and shred the drive with Disk Utility and then reinstall from there.

Boot the system with a live usb and overwrite the entire disk device with noise, shred will do that.

Warning I do not know if there is anything specific with macs that would brick it if you overwrote the entire disk device, so be a bit cautious read around before you do it.

Ask HN: Wiping a Mac – Best Practices?