Everyone could display themselves on any popular product page on GitHub. Probably, the team should do something with this.
First of all, the Dependency graph is a list of packages used by your project.
Then, the product's "Used By" section will contain a list of dependent repos.
And this is a field for tricks and abusing the function. Everyone can display themselves on the page of a popular product. It is obvious but all you need to do is just to add some product as your dependency. GitHub fetches lock files for popular package managers and links them automatically.
Experiment
I've created an almost empty repo with lock files created by the Go manager:
go mod init github.com/talyguryn/talyguryn
go get github.com/telegramdesktop/tdesktop
And here is it — you can see my repo mentioned on the main page of the Telegram Desktop project. I guess owners of Telegram wouldn't want to see me alone in that block on their product's page.
You can read more information about the dependency graph on GitHub's docs page.
Conclusion
Seems like the "Used By" section could be abused by everyone in the current implementation. The owner of a product won't be able to hide this block or remove some dependants from here.
I think GitHub should allow hiding this block via the Repository Settings.