It appears there is only one way to disable "subscribe via rss".
Or it could be me, but I did try a few different ways.

Set categories to default off global entry layout settings.
Then went into views, layouts and disabled and it still showed.
Adjusted the menu item to hide and it still shows.
The only way it didn't show was when I disabled the entire RSS in General, RSS.
However, this disables for the entire site, correct?
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