Hahahaha. I stumbled upon Flow last year when I switched jobs. Our IT/procurement process is ridiculous, so I scrounged around our intranet resources for licenses and tools that I had access to by default or could get/request access to without triggering the Eye of Sauron to gaze down upon me from the tower of IT Security.
My team does analytics consulting work for large multi-agency marketing campaigns, and I used Flow and a shared mailbox to create sanity around managing the constant flood of daily/weekly/monthly data snapshots that get emailed and have to be synthesized and combined for end reporting/analysis.
I was also able to use Flow and PowerBI to duct tape together a "starter data lake" architecture for our marketing clients. It's been a wild success with clients, due in part because of it's price (in context to their expectations for traditional "data lake pitches") but even more so due to the fact that it gets rubber stamped through any IT review thanks to being all part of Microsoft. It fits most clients workflows and data volumes, and seamlessly transitions to a true data lake by pulling in Azure services as needs mature.
Most marketing departments are swimming in data but pretty lacking in their access to technical and process/operations resources to truly manage and leverage it. Flow has been a fantastic tool to introduce structured data management and automation for these clients, as it's low cost enough to slide under the radar, already implicitly allowed software as part of their Office 365 license, and gives them tangible results to show when asking for more budget to develop/mature it further. It's far from my favorite stack to use, but it's good enough to get the job done and breezes through all of the checks and objections and red tape that would make virtually any other stack dead on arrival.