I think its kinda funny that Office is so ubiquitous that everyone forgets how the productivity software market is like. Microsoft has 90% of it, so credit to Google for taking on the incumbent. It will be insanely hard for any challenger to dislodge MS from a company with thousands of employees, let alone build multiple products to beat all of the ones bundled in Office. The moat is large, like taking on Google themselves in search/ads