Why does OAuth login to this forum via Google request the permissions it does?

I went to log into this forum using Google OAuth login and was shocked to see that the CKEditor forum app is asking for the following permissions on my Google account:

• View and manage your spreadsheets in Google Drive
• View and manage any of your documents and files in Google Drive
• Manage your contacts

That seems really outrageous. What possible business does CKEditor forum have in that kind of access? The only things that come to mind are all negative :-(  Even viewing those things would be too much, IMO, let alone managing them! What if your code to manage my contacts or documents has a bug and deletes them? Do you really want that kind of responsibility? Apologies if there's a legitimate need to have that level of access - if so, it would be good to hear what the need is.

Thanks!

Terry