I do machine learning/data science consulting, mostly for startups. Literally 80% of my time is cleaning data and coding up basic ML for their excel spreadsheets :)
Most of the data outside software startups is in Excel spreadsheets :)
And yes - believe it or not I rolled out a Beta version of an AutoML app for spreadsheets app today!
Email me (email in profile) - not open source but completely free Beta. Just trying to figure out if it's something people would be interested in. (Edit: email rather than DM)