A couple folks I've worked with over the years go out of their way to highlight some of the bad stuff, and use it as learning material for future work. But it's usually coupled with "hey, we're partway through this, but the numbers are looking pretty bad right now, we should probably stop this now and rethink things". That said, I've generally only been at the smaller-self-serve side of things - the ability to stop/start campaigns with 5 and 6 figure budgets is probably a different ballgame.
A couple folks I've worked with over the years go out of their way to highlight some of the bad stuff, and use it as learning material for future work. But it's usually coupled with "hey, we're partway through this, but the numbers are looking pretty bad right now, we should probably stop this now and rethink things". That said, I've generally only been at the smaller-self-serve side of things - the ability to stop/start campaigns with 5 and 6 figure budgets is probably a different ballgame.