Yes. Googling “Dashcam legality in the EU“ (or elsewhere) confirms this.
Some countries prohibited, others you are not allowed to upload or post.
Germany takes personal privacy very seriously to the extent that even Street View is not present on Google Earth. That said I followed a Googlecamera vehicle along the Rhine Valley a few years ago so Google still take the pictures.
My dashcam has been in full view in border checks between France and Italy. A friend was wrongly spot fined for not stopping at a stop sign. I wonder what use it would have been arguing with the gendarmes!
French drivers generally tend to challenge authority, I had a long lift in a taxi last year; his satnav ( not sure of the make) was warning every speed camera and alerting to him to speeding. He was calling the speed cameras ***** Sarkozys and it took me a while to work out the association.
Anyway it looks like I have an excuse to cross a permanent intallion off my to do list and put up with trailing wires a little longer

There is a world of experience of taking Calis apart and the pros and cons of doing things. Unfortunately not so much with MPs. I wonder whether this is also because you don’t see many bespoke conversions of the V Class other than Westfalia. Surely the Mercedes V Class must be a good starting point.