Because the general principle of patents is that the owner is granted a monopoly on its use. You can add in exceptions, but it turns into a can of worms. eg. should "home" users be able to bypass patent laws in any product? what counts as "home" users? can other companies abuse this to bypass the patent system entirely? eg. you invent a widget, you patent it so competitors can't rip you off, but they sell widget kits: parts that allow a home user to assemble their own widget, exploiting the home use exemption. should that be allowed?
Well, in a way, home users do violate patents now.
It is not like anyone is looking all that hard.
Seeing an EULA on food doesn't seem like it will end well.
We are already struggling with who owns something. Software, in many cases results in what is essentially a rental without the advantages inherent in rentals, and lots of downsides.
Right to repair is a matter of growing importance.
Now food?
Frankly, I would much prefer do it at home get a broad exemption for self sufficiency reasons, if nothing else.
Arguably, nobody needs this food. I won't have anything to do with it.
Fine.
But the EULA will spread. Clearly someone has thought it time to maximize revenue in this way, and if they are successful, more will follow.