Regarding WhatBird, I know I first stumbled upon the app around 2016 when they still had a version for Windows Phone.
Then later on, I got tired of Reddit's lack of a dedicated "birding" subreddit that wasn't full of pictures, and the
WhatBirdIsThis subreddit has way too many low-effort, low-resolution posts with mourning doves and robins getting upvoted, while many proper ID questions don't even get comments. For example, looking at the recent posts...
Like...seriously? I get we're all newbies at some point, but 700+ upvotes and 100+ replies for a bad photo of turkeys on a subreddit about bird identification? I figured it was time to look for a proper forum (where you'll get one reply with your obvious answer, then the thread will die), and I found both BirdForum and WhatBird.
I had no idea we had a thread going over on BirdForum, though, as I mostly hang around the Birds & Birding board because it fills that discussion desire.
As the WhatBird Forums seem to partially work, especially if logged out or using direct links to certain pages, I'm sure most of the data actually still exists in the database.