This isn’t a monetary thing that YouTube says - the goods a few miles away in Germany aren’t seeing this, despite being in the same currency and no difficulty transporting them. In a free market a competitor would buy from the same supplier the german supermarket does, undercut the competition and force all prices for.
However that doesn’t work because consumers in Austria don’t realise how they are being ripped off, because while the large corporation has all the data to manipulate and extract maximum revenue from each consumers the consumer lacks the data to do the opposite.