If a creator and a platform are splitting a dollar and “the real cut for a creator is ~15%”, I’d expect that to mean the creator gets $0.15 and the platform $0.85.
Reading your answer I get why the wording is ambiguous. I read it as “the real [revenue] cut for a creator”, keeping the same meaning for “cut” as in the page title.
Exactly. It's cut as a verb (to reduce) versus cut as a noun (the share of the total). In this case, I think the sentence structure has it as a noun, even if the author was thinking of the verb sense of the word.