I believe the point of SulfurHexaFluri's final sentence is that it is cost prohibitive for Apple to dedicate a bunch of employees to search for bugs in order to

I believe the point of SulfurHexaFluri's final sentence is that it is cost prohibitive for Apple to dedicate a bunch of employees to search for bugs in order to fix them all. That is, it's cost-effective to find 1 bug, but not to find all of them. The sentence could have been worded better.