ACMA found 157 accounts remained open and hundreds of messages reached people who had registered to exclude themselves from wagering.
The package sets a 2027 start date, gives ACMA the enforcement role and leaves critics saying it falls short of a full ban.
The deal would also cap betting ads around live sport and ban them on jerseys, in stadiums and after sign-up.
The agreement also gives each company reciprocal Australian patent rights and a royalty-free licence to responsible-gaming technology.
The watchdog says it can only act when most site users are in Australia, while parliament considers a broader test.
The anti-scam centre says the websites mimic gambling apps and trap withdrawals, with First Nations communities hit hardest.
The bookmaker has been told to strengthen risk checks, suspicious-transaction reporting and internal processes under a binding undertaking.
The company says the money will support liquidity and new contracts, and its BetStop register has logged more than 28 billion checks since launch.
Australian government continues its tightening of the online gambling regulations, with a complete ban on gambling advertisement also being discussed over the coming weeks.