The technologically maximum number of concurrent editors that Google Sheets supports is perhaps the least important constraint when trying to crowdsource an information-base. At a certain point (well below the point where Google Sheets crashes) you run into community constraints around permissions, validation, how you organize the data, how you record changes, how you discuss changes.

That being said, this article seems to completely ignore the fact that there are already well-established solutions to this problem. Off the top of my head, wikis and GitHub/Lab pages offer very nice solutions to creating a scale-able information-base with built-in features to help address some of the challenges I raised above....