I once worked at a firm not unlike Accenture - essentially management consulting - and was on a project that ended up being a frontend reskin of a Fortune 500 company website.
But at the project inception I was asked to scope the project and no one, either on our side, or the client side knew what the scope was. So I put line items in with pretty large time estimations as placeholders for the skinning their SaaS application as well as the website.
The client glazed over the Gantt chart (created in MS Project) and signed off on it.
In the end, we did design, frontend build and integration oversight on about 15 templates of their .com. This is the kind of thing any run of the mill digital agency could and would do for 50k. We charged them 2.1M.
This kind of project (now with AI/ML/Blockchain!) is Accenture and the like's bread and butter.