Here's how I see this working out . . .
Class action suit against Deere, Apple, GM or some other biggie, and the biggie loses. (Or if they don't lose outright, they have to make some serious concessions).
The lawyers for all the smaller players realize that if General Motors can't fight this and win, they need to change their game real soon now.
As an example, Rolex and Swatch Group (which owns probably 50 or more different "names" in the watch business) don't sell parts. You have to send it to THEM for service.
There are ways around this but it would be much simpler if someone could just order the parts from them and have a local watchmaker (a dying breed, by the way, "no parts" has something to do with that) do the work. Since the parts and service are captive, the prices tend to be really, really high and you have no alternatives - so you get to suck it up.
I have a Rado Ceramic watch (Swatch group) and they won't sell parts. In fact, they wouldn't even tell me the battery number, saying "We don't like other people working on our watches." First, it isn't their watch any more, it is mine now, and second, I can have any part I need sent to me from the UK, and from several sources. (And I have done so.)
There's not a huge amount of money involved here (I can always buy a different watch), but there are instances where a LOT of money is a stake.
Deere is likely going to be one of the first targets for a class action suit. The products are expensive, the owners are not willing to let themselves be pushed around, and Deere has deep pockets (a requirement for the success of any lawsuit). Apple will likely be next.
One of the things this ruling is going to eliminate is stuff like a popular brand of ear buds which use a specific Varta battery. Varta will not sell these batteries "outside", stating a contractual obligation to the earbud maker. Of course, if your battery goes dead and you send it in to the ONLY service center, well, you're gonna need a new one, this one is unrepairable - send money (and there's a disposal fee or a return fee for the old one as well).
This is just beginning, and there are enough people who want it for something to happen. At last.
Best Regards.
Mike/Florida