I just noticed this, when I crawled under there to replace the old fuel hoses. The CV joint boots are 11 months old and have about 490 miles on them.
I paid a shop to do it, as I am getting lazy in my old age (and it is a VW, not a Porsche). It should have been a tip off I guess when I discovered that the shop did not have a lift, but they said all the right things and I directly asked them about the quality of the CV boots they were going to use, and was assured that would be fine.
All 4 boots have the cracking seen at the small end - this is the only one that seems to have completely opened up (fallen apart).
Maybe they were made from Chinese drywall???