Sure, but free software projects typically do not work based on the principle of "What's the worst they can do in court" or "Are they really going to sue us," t

Sure, but free software projects typically do not work based on the principle of "What's the worst they can do in court" or "Are they really going to sue us," they work on the principle of "What are we actively and explicitly allowed to do." Otherwise they'd have no worries about incorporating clearly abandoned code, or incorporating code with an unclear license and not selling it knowing that they can always reply to a lawyer letter with "Oops, sorry." Otherwise Beerware and WTFPL and the JSON license would be free software licenses. It's quite clear that Mozilla isn't interested in suing Hyperbola or any other free software distro for being a distro and doing distro things, and that in the worst case, they'd send a nice message first and Hyperbola could choose to discontinue distributing Firefox and Rust. Yet Hyperbola wants to take the "explicit permission" principle to an extreme and discontinue distributing them now, proactively. They should be consistent and cease distributing everything else.