This gets repeated so frequently online it’s bordering on an (inaccurate) trueism because people vastly overestimate how at-risk entities are for losing their IP. A niche Dreamcast project is not a threat to Rockstar. They’re not going to look up one day at a reality where due to piracy the courts strip one of the largest video game companies in the world of their core IP. Frankly that’s too ridiculous to even consider a possibility.
