This is only true if you use GDrive as nothing more than a file store, which most people don't. The above mentioned wiki is exactly the kind of software someone in the company finds, buys, gets the company reliant on and now you can't switch away from GDrive because that thing wouldn't work anymore.
And because Google does not participate in standardization efforts for document formats, the exported Docs/Sheets/Slides files you get from GDrive won't have any of Google's admittedly cool features, they're simply discarded when exporting.
https://youneedawiki.com/
As the files are all stored in Google Drive, so there's no vendor lock-in.
The documentation site is also made with their product: https://docs.youneedawiki.com/