Re: An M1 Mac Mini isn't going to break the bank
I'm not voting either way - it seems a dig into the agreement between the devs and Apple would be a prerequisite, along with a look at statutory rights in the relevant territories. Sales of Goods wouldn't cover a loaned device, and as I'm not a lawyer I don't know if the 500 dollar fee was for a service (which requires the device kit to actually work) or what.
I would imagine any serious Mac OS dev would want to have an M1 machine for testing, and this testing would be better on an actual Mac and not a dev kit.