GitBash is a POSIX environment that includes the titular bash, and it doesn't include bc, which is a direct counterexample to your original assertion. Lots of people who are stuck on windows for one reason or another still want or need to use bash, and that's why they use GitBash!
Clearly, if Amber did not have a dependency upon bc, it could then potentially provide value to those users.
Clearly, if Amber did not have a dependency upon bc, it could then potentially provide value to those users.