Linkedin restricted my profile although I was not active much. I should give my identity card photis and did it but Linkedin is not satisfied.
I would never use a website that demanded my ID card.
The next thing that might happen is that my ID would be for sale on the dark web.
@ Kninjianin: I think you are right.
Other reasons ?
Never used it much any myself. Not much of a website user either but I would never give ANY site copies of my identity cards or such. When they start asking for too much? I back away quickly!