Apart from the US (where paper checks still circulate and I assume fax machines are everywhere) are there other places where blinking the red tail light is an a

Apart from the US (where paper checks still circulate and I assume fax machines are everywhere) are there other places where blinking the red tail light is an acceptable indicator signal? What’s wrong with just mandating indicator ligts? Every car manufacturer can make them - because obviously they are required elsewhere - so why go through the trouble and cost of manufacturing a worse solution as well?