The author later speculates on why: > I actually was thinking along the lines of "interesting coincidence" but now I actually believe it is not a coincidence and they really did do this just to prevent people discussing welding Bing and "AI" into the FUCKING KEYBOARD
A lot of product companies are closing user forums from the early 2010s. My guess is that there's some legal issue involved. Maybe the lawyers were convinced that somebody posting illegal or confidential info on an unmoderated forum is a big risk, and deleting the entire things is cheaper than paying some moderators.
They are just cutting costs. Forums need moderators (I am one of them, lol), and businesses can't rely on volunteers for that. Expect them to open new forums whenever they need to push adoption of some new product, re-hiring mods as part of the budget for that push.