"Or put developers of 90s games into prison."
After the events of a certain 1990s Pokemon episode, where a couple of Japanese TV producers almost DID go to prison, games developers and cartoon producers were _extremely_ careful to stay away from certain flash rates and colour combinations.
https://www.nytimes.com/1997/12/18/world/tv-cartoon-s-flashes-send-700-japanese-into-seizures.html
This was kind-of known before 1997 (7Hz strobes were known to trigger some people back in the 80s when I was playing with lighting and many pieces of hit had lockouts or warnings to avoid particular ranges of flash frequencies) but became a major study after that event because it was found that a lot of people were set of who previously showed no sensitivity to flashing would get triggered by flashing colours.
And yes, if you setup flashing lights which injure people - even unintentionally, you CAN go to jail in many countries.