I worked at a company that has a flagship product that is a web-based spreadsheet.
The company uses huge spreadsheets to manage their network infrastructure.
These spreadsheets are so large that their own flagship web-based spreadsheet cannot handle them, so there's a whole section of the company running Excel on Windows workstations to manage them.
I worked on a replacement project for that.
It was also a web-based spreadsheet.
It was about three years old when I joined the project and I worked on it for two more years (before quitting.)
Punchline: It also could not handle the large spreadsheets.
(Sad truth: tens of millions of dollars and tens of thousands of dev-hours wasted with zero payoff. PMs getting promoted up and out and leaving the project behind resulted in a classic "Lava Flow"[1] mess. You could actually see the layers in the code and VCS.)
[1] https://en.wikipedia.org/wiki/Lava_flow_(programming)