No, I don't fence off metaphors for exclusivity. Good ones get reused.

And claiming Lorde was only talking about race is simply incorrect.

Of course she wasn’t; she’s a poet so everything she says has multiple meanings, but context matters. The issue of race and personal marginalization is inextricable from the quote. She would have used a different word than “Master” otherwise. Context crushing it this way diminishes the effectiveness of any argument you may be using it in support of. You can choose to use whatever metaphors you want, but other people will add their own context.

It’s the same reason you can’t say things like “final solution” — the phrase has societal context and its use is distracting at best when used in another context.