Comment by johnnyanmac

There isn't, but the way anti-trust works it more or less says "You need to do X by Y date". That X usually nudges a path or least resistance towards iplementing and servicing a new feature (or undoing chokeholds on old features), but as we see with the DMA Apple can play with loopholes for months before getting with the program.

To your example (and excuse my lack of sound legalese), they wouldn't say "Apple must implement RCS", they would say "Apple must allow for an cross-compatible solution" or "Apple must document XYZ features keeping competitors from implementing a proper iMessage alternative".