Because it's cheaper and more reliable to outsource that to a company specializing in it. If one dev had written it, how many times would that tool have failed

Because it's cheaper and more reliable to outsource that to a company specializing in it. If one dev had written it, how many times would that tool have failed by now? When the original dev left the company a decade ago, the tool has been transferred between teams six times, it failed a migration and the email address it used to send errors to no longer exists so nobody noticed, and it's literally gotten lost in the shuffle?