Many apps have code that is closed and not visible publicly. Other apps like CoMaps, have code that anyone can see and use. What makes open-source apps great?
Transparency: You or any developer can peek under the hood, see exactly what happens and how your data is handled.
Community Power: Developers worldwide collaborate, spot bugs faster, and add cool features you’d never get from closed-source code project.
Innovation: Because anyone can improve or fork the project, ideas evolve quickly— crowdsourced creativity.
Freedom: No lock‑in, no hidden fees, and you keep control of your digital life.
“Users” can be co‑creators, making software safer, smarter, and more adaptable for everyone.
I get the impression you think corporations aren't major open source contributors.
Gaming is an even small fraction desktop linux use. Desktop linux is an even smaller fraction of FOSS.
Linux kernel for example:
https://lwn.net/Articles/915435/
Your guess.
It is there to check if you aren't satisfied with the provided stats.
Before pushing for further evidence, the burden of proof is currently on you, as in why the stats I provided wouldn't be sufficient.