Please show a source for that claim. Afaik having the dashcam is legal (under conditions like it being mounted securely, not obstructing vision, recording limits so it's not surveillance,...) but publishing the video might violate data protection laws
replyI stand corrected, what is illegal is to operate them continuously, not to just have them as I simplified above.
reply"If, for example, you use a continuous recording of the road in which other vehicles' license plates are visible to defend yourself against a traffic ticket, you could be violating data protection, a serious offense that could be punishable by a fine of up to 300,000 euros."