Yeah but third party tools like iMazing have the ability to check for Pegasus. All it does is look for the presence of certain files unique to Pegasus. Why can’t Apple do this too or buy such tools from iMazing? Not like they can’t afford it.

If there is a public tool, which checks for Pegasus, NSO will simply modify Pegasus to evade such a trivial detection. I would even assume that every Pegasus-infection is pretty unique due to mutations between every sample.

Everybody who claims Pegasus and other ATP-malware is trivial to detect has no clue what he's talking about.

If Apple does this, you would say that why Pegasus would not change that certain files.

Ah yes, the "put your head in sand" approach to problem solving.

iMazing runs from a separate device, doesn’t it? You can’t trust the phone to check itself.