Purely as a coincidence, India and Australia will both remove the immigration departure cards effective July 1.
India used to require its citizens to fill up the card for all international departures. Foreign citizens were exempt. In case of Australia all passengers had to fill up the card.
The India requirement for foreigners, including Persons of India Origin (PIO) and Overseas Citizen of India (OCI), to fill up an immigration international arrival card will still continue, as will that of all arrivals in to Australia.