EU freezes/takes over all Apple assets in EU

Most value/assets are in the US, I don't see how Apple in the EU would have enough interesting assets to refund. If 30% of the 450M inhabitants in the EU have an iPhone and the purchase price was 1000 Euro on average, that would be 135B Euro. I would be surprised if they have a fraction of that in the EU as assets. The primary useful asset I could think of is if the iOS source code was also stored somewhere in the EU. I guess in war it would be fair game to fork it. Wouldn't help with the existing iPhones, since the EU doesn't have the signing keys, but you could bootstrap a new phone ecosystem (and even revert Liquid Glass :p).

If the money isn't enough for the refunds, a finance mechanism can be created that will be settle after the war.

There are huge assumptions in this, like the EU wins the war, the war doesn't end in a sort-of cold war, Apple cannot get away from liability because it was not their decision, etc.

The returned devices may be sold to 3rd party markets if Apple isn't cooperating.

Flooding a 3rd-party market with over 100M second hand iPhones would drive down the prices by an extreme amount.