You can watch Piggy Pots online for free in Australia on the Slots Launch demo page, which says no registration or download is needed and lists the game as a free demo.

Best option

  • Slots Launch demo : free-to-play version of Piggy Pots, available online in browser.

Other free slot-style options

  • Free Pokies Australia sites often host free demo slots, though not necessarily this exact title.
  • Pokie.fun also offers free browser pokies in Australia, but it is more of a broad free-games site than a specific Piggy Pots listing.

Video watching

  • If you mean watching gameplay rather than playing the demo, there are YouTube videos showing pig-themed slot machine sessions, but the exact Piggy Pots title is not clearly confirmed from the results I found.

Note

  • Free slot demos are usually for entertainment only and often use simulated credits, not real-money play.

TL;DR: The clearest free Australia-friendly option is the Piggy Pots demo on Slots Launch.