I once saw a layoff that was followed by a week long outage because no one remaining knew how to deploy to prod, and no one knew how to recover after the failed deployment. I felt bad for the people remaining who had to go through that,but it was hilarious.
They’ll get acquired and top people leave as their stock vests or get pushed out because the megacorp wants someone different in the seat.
The people who knew the tech are gone and you’re left with an unmaintainable mess that becomes unreliable and no one knows how to fix it.