Ditto. They consistently do their own thing, and famously had their own stage last time they did Download. Whilst they did do Power Trip 2 years ago, that was no doubt for a Gargantuan fee. I can’t think of a single reason why they’d do Glasto - the money’s sh*t and they don’t need the exposure
Feels like AC/DC is more of an "our own shows" band rather than necessarily in the running for festivals. Could more likely see them pick UK outdoor venues instead.