You may be right (I could’ve remembered it wrong).
With the crawlers the text at least changes/moves which avoids some of the burn-in, and it may be why ABC News 24’s text has that transition.
I think mappy is worse because it’s opaque and it’s there almost all the time (percentage wise ad breaks are so minimal).
Historical note that Seven was the first network to introduce these promotional elements to their watermark in Australia and the first program promoted was MKR.