Not sure why this comment is being downvoted, it's a good point. The GP includes this quote, echoing many other people I've encountered who build software:
> The business and industrial world largely still runs on excel spreadsheets, emails and word docs. Those are all areas ripe for new products and many of the top companies in those niche areas have no idea how to apply technology to solve their problems more efficiently.
Spreadsheets are incredibly useful tools! They're general-purpose, easy to use and powerful. Millions of people use them for programming without even knowing it.
Email is still great for communicating! It's everywhere, it's easy to use and it's totally interoperable. How many startups are building decentralized communication tools right now? Email has been federated for decades.
The notion that use of these tools is an opportunity for some more efficient proprietary solution is a bad assumption. People use them because they're good and they work. The parent is right: there's less demand than you think.