Not an XC40 owner, but a good question asked by the OP., so I thought I'd chip in to spark a bit of discussion.
It's a new and expensive model, so ownership is still limited and most of these will be with the original 'purchaser' I'd imagine. Outselling the Ford Focus in September however is a hell of an achievement by Volvo!!
As 80% of new cars are 'purchased' on PCP and then 80% of these are returned at the end of the deal, the chances of the 'owner' being interested or inclined to service or modify etc. must be low. I guess it's just a drive and main dealer service vehicle all the way for the majority.
VOC membership still seems niche, and mostly older models in my area. Not aware of a new XC40/60/90 ever turning up to a meeting.
When they become an affordable 2nd hand car, I'd expect the forum use to rise as people want to know how to change brakes, ATF etc. Currently owners seem limited to questions about bluetooth, delivery and mpg! (Mike - good point made about reading the manual
).
The reality is as well that forum use is dropping as the world moves to anti-social media. The 480 forum I use only has about 10 regular contributors now!
Great looking car by the way. Must get a test drive at some point.