I cannot speak from experience,
but from what I've read over the years, people who buy pirated software are ordinarily advised:
(1) that the software will never need updating or "patching" to correct flaws, or, if it is updated, then a copy can be bought more cheaply from the pirate; and/or
(2) that updating or "patching" the software will introduce "problems" that might make it impossible to run the software (which is unfortunately sometimes true even for legitimate installations).
So, even if the pirated software is an OS, and some specific deficits can be patched "safely", people who use pirated software (which they may or may not know is pirated) often lack the knowledge that they need to do that and they don't bother.
They depend upon the pirates.
