"It's not as plan because it doesn't.." (describes thing that isn't a goal of the plan). This is nonsensical. Not even wrong. This is the entire point.
> Again, the sovereignty aspect means all of this (develop its own industry and economy) must be addressed
No, you simply are not understanding "data sovereignty and security" at all.
> a huge cost for very little.
Citation needed. You assume the costs are "huge" and I am not convinced at all - as others have noted there are existing open-source libraries to underpin this now. Likewise the small size of benefits is your unfounded assumption. Security benefits are not measured in money on a stock market.
Many government functions such as standing armies in peacetime are actual "huge costs". But they have benefits not measured in money on a stock market. It's an incorrect framing in that case too.
You're just repeating misconceptions.