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That's just a general list of differences between physical and digital things.

Trade restrictions on physical goods don't exist due to matters of ownership.

> the same stock cannot be owned by multiple people at the same time.

This may be an irrelevant tangent, but that's entirely untrue.

clearly I need to learn more about stock ownership; but that would require the opportunity to own stock. And I'm from a secondary/lower socioeconomic-tier from a 3rd tier (third world country). So those opportunities aren't readily available to me.

regardless,

the restrictions on trade of physical goods exists due to matters of ownership over government-level permissions (licenses?) for import/export, taxation, an other such kinds of things. It's ownership over whole countries; that's the ownership at play when considering digital trade restrictions.

trade restrictions exist for many other reasons than 'ownership': political reciprocity, agricultural security, product health and safety, national security, etc. When these types of products come through customs, it doesn't matter who owns them, they're prohibited because of the inherent qualities of the items themselves.

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