It's absolutely important for all households, all individuals, to file returns. While I can't speak to the details, the Canada Revenue Agency has an active outreach program particularly focused on low-income individuals, indigenous people and others who may not traditionally have filed. Considerable outreach is under way, and it's associated, of course, not just with the climate action incentive payments, but also with other kinds of fiscal reimbursements such as the family benefits, GST rebate and so on, again, which can only be accessed through filing an income tax return.
On March 12th, 2020. See this statement in context.