A huuuuuge part of why companies, especially public companies, especially those in regulated industries like healthcare and finance are willing to pay eye-watering sums of money for a SaaS app that you could get an MVP up in a few weeks time from a competent team with no AI is that they need a phone number to call when something shits the bed at 2 AM on a Wednesday. They need support SLAs without the payroll and headache associated with it. They need someone to sue if things truly go tits up.

Moving SaaS apps in house is a great way for a VP to get a fat bonus or a director to get a promotion but I have to imagine it keeps the CIO/CTO up at night unless they're fully asleep at the switch.