It's funny to me, because just yesterday I was a having a conversation with a colleague who asked me if we had a "corporate account" with another commons SaaS PM tool that he has been using with his team. I think he was in shock when I listed all of the project management and collaboration tools that that I've seen used in our organization. There are no "standard" project management, planning, organization, sharing, etc. tools at big companies. There might be "official" ones, but then managers and directors just buy whatever the hell SaaS they want on a credit card.
Shadow IT is a thing. No company avoids it. I'd assume most Global 2000 companies use just about every single popular tool you can imagine _somewhere_ within their organization.