It's appropriate for software designed for use cases where an attribution requirement would be inconvenient or otherwise undesirable. For example, https://githu

It's appropriate for software designed for use cases where an attribution requirement would be inconvenient or otherwise undesirable. For example, https://github.com/microsoft/tslib https://github.com/microsoft/tslib uses it, because that library is automatically included in any TypeScript program that uses downleveling, so if it had an attribution requirement then that requirement would apply to every program written in TypeScript, which nobody wants. (GCC and LLVM do something similar with their special runtime-library exceptions to the GPL and Apache License, respectively, but tslib lives in a separate repository from the rest of TypeScript and so could easily just get a separate license.)