Nintendo Switch emulator, Yuzu, developers settling lawsuit from Nintendo with $2.4M payout, handing over its domains, and agreeing "Yuzu [is] primarily designed to circumvent [DRM]".
I started out in the computer industry working for a company that reverse engineered and built IBM compatible terminal systems, This was more than 40 years ago, when that was its own large and profitable sector of the computer hardware market. It was absolutely legal to build 'plug compatible' reverse engineered third party systems. DRM is almost entirely horseshit that has helped turn the entire tech industry into silo'd enshittified monopolies.
Nothing capitalists say about feudal rights mean much of anything. More or less the entire tech industry isn't allowed to have non-competes and it's such a big field because of it.