Yes - and the consumer is choosing to buy this product. You can't claim that the vendor should change the product after it has been purchased.

No I don't think it is overreach, I think it is good business. Other institutions (usually, ideally) put constraints on capitalism, through e.g. mandating USB-C, which could also be applied to printer cartridges. A printer company could even do a Patagonia, and make the most environmentally friendly, reusable, printer system available and make it part of their branding.