6 years ago, I had a friend get his Apple ID compromised by an ex-.. He was effectively locked out of his laptop which he'd used his Apple ID to set up and sign in to. No recourse, so it meant that I had to do a full wipe and reinstall, and thankfully his music and photo projects were always religiously backed up to a pocket drive, so he lost nothing. At the point when he went to set up the newly installed OS, I insisted he use a password and NOT his Apple ID to secure the machine.
From then on, I've made it a point to have family and friends NOT use their Apple ID for their computer login credentials. This guy's story only enforces my belief of the foolishness and danger of relegating one's data to a third party's cloud.
If the guy in the linked blog had stored his shit locally - it's not like pocket drives are expensive - he wouldn't have gotten into such a nightmare.
I learned the HARD lesson myself back in 2004 when an iTunes update went sideways and lost my entire music library. poof! into the void it went and I spent the better part of a week re-importing my CD collection to an external drive. Never again.
Sucks for people that fall into these kinds of fiascos with cloud storage. Take my advice: Don't rely on it w/o having local backups.