Most companies have an owner and a process for starting things: a budget line, an approval, a kick-off. I keep seeing almost none for stopping them, so tools, hires and data work carry on after the reason for them has gone.
My view is that data, and the spend around it, is company capital, not a cost centre parked under technology. Capital gets reviewed, and some of it gets withdrawn. I make that withdrawal as legitimate as the original approval, with a euro figure beside each decision.
The work ends in decisions made. You get a list of what to stop, change, keep or start, and I stay until the first cancellations are made. Then I leave.