It doesn't matter if government funded startups have been successful. It's not the government's job to provide capital to high risk ventures. They should provide public services for the people and regulate the private sector according to the interest of the people.
Well, depends on your definition of high risk.
Basic research is definitely high risk, in that return for investment may happen generations from now if ever. I'd argue that funding of basic research through universities etc. is part of government's job.
And funding for basic research should be made so that the results belong to the public, for example through universities as you mentioned. Not through private startups.
The comment you're replying to is tainted with the survivorship bias. We see successful companies that got government funding, but not the opposite. Maybe we'd have more innovation and competition without government picking these specific winners.
Ironically, one of the companies you mentioned (Apple) now operates in an environment with very little competition and regularly faces antitrust claims.
Government picking winners may actually reduce competition in the long run.
The key difference: when private money picks wrong, it's their loss. When government picks wrong, it's taxpayer money.
