Some things like semiconductor fabrication will have huge barriers to entry for the foreseeable future due to being massively capital intensive and involving lots of trade secrets etc. We can't really do much about this.

What we (ie. the government) can do is ensure no entities own the entire supply chain, so you can't run a fab and also market finished consumer goods. That way, manufacture of consumer goods (including the software) from the raw fabricated parts gets a much lower barrier to entry.

We can also force consumer manufacturers to advertise all "features" that we deem to be important. We already do things like energy ratings, why not privacy ratings too? The more information consumers have the better.

Make no mistake, any capital intensive industry like electronics will degenerate into an oligopoly without government, or you can dream of a day where everyone can print semiconductor wafers at home.