(Well, not quite inexplicably. Wikipedia cleared it up for me.)

Me. Unless it's clearly stated outside. It's why I wear a covid mask when shopping.

Because the world is bigger than just the wishes of private businesses. I don't think there is anywhere on this planet where you as a private business can do literally whatever you want, there are always regulations about what you can and cannot do. The first thing is usually "zoning" as one example, so regardless if you own the land, if it isn't zoned for industrial/commercial usage, then you cannot use it for industrial/commercial usage.

What libertarian utopia do you live in that would allow land owners to do whatever they want?

The Australian Privacy Act falls well short of European standards, but it does encode some rights for people that businesses must abide by.

Unless you think a grocery store should be allowed to grab you and sell your organs then you agree that this private organisation should be subject to some limitations about what it can do on its own land. The question is then where the line should be between its interests and the interests of those who go on the land.

You can be absolutist about this, that’s certainly a position, but it’s extremely far from mainstream.

It generally owns more weapons than your average deluded shop owner.

Say I implement facial recognition anti-fraud via an army of super-recognizers sitting in an office, watching the camera feeds all day (collecting the sensitive information into their brains rather than into a computer system). It'd be more expensive and involve employing staff (both the "technology of convenience" criteria. From a consumer perspective the privacy impact is very similar, but somehow the privacy commissioner would interpret this differently?

Maybe that is the point the privacy commissioner is trying to make, that collecting this information through an automated computer system is fundamentally different than collecting this information through an analog/human system. But I'm not sure the line is really so clear...

Like, I thought a big part of why some stores do loyalty cards is because they enable tracking things that they'd get their credit card privileges revoked if they tracked that way.

Well, since you mention it: I have prescription drugs that I am allowed to buy, but I am NOT allowed to abuse them. I must take exactly 1 each day.