On the Wii, every time you’d start it up there would be a big screen with white text on black saying that it can cause seizures in a small group of people. I’ve heard that the PlayStation 3 also has this.
However, the 3DS, Wii U, PlayStation 4, and Nintendo Switch never require you to see this—it is in a manual or hidden somewhere in some software built-in but not ever opened by normal users.
Why did this change? Was there some legal decision or law that changed that caused this disclaimer to not be legally necessary?