Once upon a time there were millions of individually-owned windmills in the U.S. There were hundreds of windmill manufacturers. Around the 1920s that went into decline. It didn't take long before all of the U.S. was dependant on power companies instead of harvesting their own energy.

Perhaps you would argue that "if we never plan for public energy infrastructure we're screaming towards some kind of Gibsonian cyberpunk future where energy is privately controlled".

Do you know any Americans who are completely self-sufficient in food production? Should we plan for public infrastructure there? Or is it ok that our food production is privately controlled?

I personally think it is foolish to move a company's data entirely outside the company and place it wholly at the mercy of a single third party outside your control. But I don't see it as needing some plan to put it into the hands of "public digital infrastructure".