Okay, the store page where the game is bought. That's even less work. It goes right near/beside/under the age rating. Call it a day without the stupidity of wasting in-game screen real estate, since it serves literally no purpose other than to virtue signal (because as others pointed out, if someone is that sensitive to seizures they shouldn't be playing any games with flashing lights to begin with).
What box?
OK some games still have boxes, but an on-screen notice at startup is the same amount of effort. Maybe even less. It's practically free.
Okay, the store page where the game is bought. That's even less work. It goes right near/beside/under the age rating. Call it a day without the stupidity of wasting in-game screen real estate, since it serves literally no purpose other than to virtue signal (because as others pointed out, if someone is that sensitive to seizures they shouldn't be playing any games with flashing lights to begin with).