Agreed! I'm also in SA, and using the official MySA Gov app to scan the QR codes. However, not everyone does, and you can just use your camera app (or whatever) to scan the codes and they'll take you to the website to sign in. So whoever put these fake codes out were relying on those people rather than people actually using the official app.

In South Australia (Adelaide, specifically), we have thousands of houses already with solar, and many with batteries (some Tesla Powerwalls) which are acting as a Virtual Power Plant - in fact, that's what the program is called. Our house is on it, as we generate quite a lot of power from solar - more than we need on a daily basis - and excess solar that isn't stored in the battery goes back to the grid. Sometimes power can be taken from our battery to the grid when they have high demand. It all sounds quite good as you do get paid for this grid-pulled power, and our electricity bills have been miniscule for the last year and a half (less than A$20 a month, and we're actually about A$100 in credit due to some months when we fed in more than we used). Of course, the power companies are planning to reduce the amount we get paid for feed in to something even less than the current low rate, so this money-saving isn't likely to continue for too much longer. We also have the issue where our electricity infrastructure in Australia is so out of date (and dependent on coal and gas plants) that it can't cope when there's too many houses feeding solar power back to the grid, so they switch it off sometimes and just let the power go to waste... ( News article from March 2021: https://www.abc.net.au/news/sc... )