The obvious answer is that this user likely also comments on other platforms that do not allow using the word openly and instead of the mental overload of constantly deciding which site does and doesn’t allow spelling out the word they choose the safer option in every case.
Or their autocorrect has now learnt to respell it anyways.
Or, they didn’t really spend hours debating the pros and cons of using either spelling and just went with whatever felt ok at the time.
But why choose generosity when one can choose snarky ass instead.