Not sure if this has been brought up before - search worked for the word 'expire', but not for 'ask diamond club'

I was trying to find out if your membership (and miles...) gets cancelled, e.g. after some time of no-activity. I was trying to look it up on the website, and to my surprise the useful 'ask diamond club' part has disappeared

BTW: even as it comes to miles expiry I couldn't find a unanimous reply - some suggest never, someone else suggested you'll need activity once per year.