Now you're suggesting that there ought to be a "warranty void if app is installed" sticker on Apple's supposedly premium hardware which is running Apple's supposedly hyper-secure operating system, otherwise some unwashed piece of software is going to damage it?
No such requirement exist on macOS, for obvious reasons. The double-think in these threads is astounding, repent.
Furthermore, claiming that Apple's review or signing processes are effective measures for preventing malware has no basis in reality. Apple has reviewed, approved and signed malware before, and they'll do it again because detecting malware is borderline impossible.
They do not possess magic powers that can suss out malware any better than industry average because (1) automated virus scanning is almost entirely ineffective against new malware and (2) they're not paying a team of specialists to reverse engineer and analyze app updates.
Now I do agree that bad software can wipe all your data or hold it hostage, but Apple currently provides no such guarantees that software downloaded from the App Store won't do that.
https://en.wikipedia.org/wiki/Magnuson%E2%80%93Moss_Warranty...