They change it because they need more money. (talking about Excel here)
And soon you’ll see ads in the fn suggestions drop down
and ads in unused cells
and ads while the Solver is running (made in VisualBasic, running on top of WebAssembly, running on interpreted Python, using a Java Interpreter on your Web Browser to make sure you watch the ad for as long as possible)

And that’s why we need to make our own spreadsheet software.