Personally, I suspect that the 20 companies each at 1% GDP will out perform the 20% company in most or even all markets. (Setting aside the issue of relative GDP between nations.)
Often, the bazaar is more effective than the cathedral.
Previous attempts to nationalize companies have not, as far as I know, been a shining success?
Only 1/2 /s there...
Not all nationalization is uncompensated, even in the real world. Further, you can imagine very fair ways, long term, to nationalize companies by e.g. requiring them to pay a wealth tax in the form of equity.
> civil asset forfeiture: enables a government to seize property and other assets belonging to persons suspected of committing a crime
The suggestion being that being wildly successful should be a crime.
You do not want your government to basically have a permanent monopoly on everything. This just gives power to authoritarian to rise.