To be fair (or pedantic), in this post they didn't have root, so cat'ing etc/passwd would not have been possible, whereas installing a doom apk is trivial.

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rainonmoon 2 days ago | parent [-]

/etc/passwd is world readable by default.

	▲	kaszanka a day ago \| parent [-]
		To be even more pedantic, it's also not present on Android.