If you are put on a PIP, at least you have some time to start looking for a new job. The takeaway seems to be, one on a PIP, put all your effort into finding the next job rather than trying to keep your current one.
I should have known better.
Far better to consider the PIP your 30 days' notice.
A PIP can happen for any number of reasons that have nothing to do with the employee's performance, and often does.
A PIP or two won't be held again anyone on its own.