In the U.S. those are 401K and a Roth IRA. Both have contribution limits low enough to make them not enough to retire on.

Did the lawmakers in Norway make such exceptions and adjust for this? Or are they just trying to keep people dependent? Why should we trust Canada or the U.S. to be any better if they tried to put this sort of law in place? There would be loopholes for the very rich (which includes the political class), and everyone else that didn't have the "capital" to leave would be screwed.

If you really want to fix things, tax capital gains from financial instruments (stocks, bonds, options, and all the ridiculous leveraged instruments on top) as regular income, and tax loans taken against such securities. At the same time, tax owned but unoccupied buildings and land, and restrict foreign ownership of real estate (you need disincentives for rent-seeking behavior and land as investment).

So you can still invest to your heart's content, but there's not a perverse incentive to hoard or leverage. If you can make more by building something do that.

But, but, but... those rich people! Stop worrying about people being rich, and stop trying to hand the government ways to confiscate, because every new method for confiscation gets enshrined in perpetuity. Having them crossing this line into imagining what you maybe, perhaps, could have gained in some alternate reality where you took some action, and taxing you based on something that didn't happen is bananas.