The cigarette lighter port is not a great connector because of how big it is, and it's pretty inconsistent when it turns off between cars (never does in 2007 Ĺ koda Fabia). I replaced the dashcam adapter's contacts with wires and installed it in the fusebox (accessible when driver door is open), branching off the headlight adjustment servo fuse. No loose cables anywhere.
The better question is why were they using the car port? Most dashcams come with power adapters to plug into a standard fuse box and can be very easily routed through interior panels with basically no tools, no permanent modifications, and absolutely no expertise required.
Absolute worst case, a local garage will almost definitely do a fitting for less that ÂŁ50 and it's worth it to avoid this exact thing happening.