Supposed to be targeted, just received email regarding the offer, but it works for everyone.
*$10 plan for $0 for first 30 days: New services only. Limit one per customer. Available only for selected Catch.com.au subscribers that received a promotional message from Catch. All data allowance is applied upfront after activation. Offer ends 9/06/21, unless withdrawn earlier. Ongoing recharges at $10 or as otherwise advertised. Activate SIM within 30 days of purchase. Optus Fair Go Policy applies.
Update: Catch has fixed the targeting.