yes Wander...i was told years ago on approach on Delta to turn off a video camera....and leaving Fuerteventura one time ..(can't recall the carrier)...the announcement included (unusually)..video cameras...rubbish.
been flying , and instructing many years...
i know of no basis (unlike a telephone) for it.....no operational basis that is.....unless its a distraction if you had to exit in a hurry...but that hardly applies when the seatbelt light comes on...