You still don't get it. This is not about all being a millionaire and thus not being able to do a job. This is about buying power. In the countries you mentioned there is still a vast gap in the distribution of wealth.

Not all Norwegians are millionaires. Not all Cypriots are either. There are a few millionaires, a thick middle class and a poor class. Same exact scenario plays in almost every country.

Automation won't make everyone sit on their asses for the very reason that new industries will be created. If you lived back in the 1800's you would probably be one of those who complained that the steam engine would replace horse carriers, causing unemployment. The matter of fact is that the steam engine and further technologies lead to a thing called "social media manager" ..a job you couldn't fathom but still has a function in society. Same will happen with automation. There are still creative jobs like graphic design that cannot be completed from simple A.I. Those jobs would be more and more in demand. Other jobs will also come in play. Humans always create value and distribute wealth amongst themselves based on the same capitalistic principles. Heck, even during feudalism same concept applies. Even in bonobo monkeys there is a similar distribution of power. The reason is simple. Tribalism.

Tim Berners-Lee gave us the world wide web for free.

not really. that's a common myth. The world wide web was a step by step process that can be said to be started even from the time of Alan Turin and cryptography. Again. A common fallacy that stems from parroting encyclopedia pages without realizing that innovation is a process. In the same way the special theory of relativity was not invented by Einstein. Einstein was the tipping point of an idea that was building for many decades. That's how the world works.

Maybe many of those millionaires would do the same: invent stuff and give it for free. Or maybe they'd just be lazy bums.

This is actually true. Most billionaires spread most of their wealth for free because they understand that after they become rich, giving back is all that gives them satisfaction. Bill Gates does that, many other billionaires follow the same path. Still though, this does not eliminate the wealth gap that is getting bigger and bigger every year. We all become richer but the wealth gap is widening.

economics collapses into psychology at the end of the day. We don't know enough about people right now to be able to predict these things.

You don't need to predict these things. You can observe them right now in nature and in economies. You can even take all the attempt of communism and marxist ideologies that believed to exactly what you were saying. Every single attempt failed. injustice though works perfectly because this is exactly how nature is structured.