This seems to be a 'make good' offer by Optus considering the many issues they had over the weekend streaming their World Cup coverage - essentially if you're an Optus Sport 'Premium' subscriber, you can head down to an Optus store this week and pick up a Fetch Mini for $0 per month for 12 months. After the 12 month period, a $20 per month fee applies
EDIT: Title and description have been updated to reflect additional info posted on the offer page
The offer is only valid for redemption from an Optus retail store on or before closing time Friday 22 June 2018.
Why only allow redemption on 22 June.. So stupid