Lots of ideas are patented, especially by large companies. Some ideas are pursued by the company themselves, while others sit in the patent war chest to (maybe) generate passive income and help with future litigation. Very occasionally they are used for prevention.
Regardless, such a system would be a reason for many people to avoid buying a particular car or brand of car.
Or show it in a minimal/headline only form.
Ideally, the app (and lemmy as a whole) would support an optional subscribe-to-spamlist feature, with crowdsourced spam/scam reporting, with some recourse for fake-spam-reports. Individual posts & usernames. Group and server admins can’t be as active as the crowd at large.