Any additional evidence (either for or against) the claim that government pays for tech advances, while the private sector is who sees a return from that?
Federal spending accounts for 44% of basic research spending. at one point, it was as high as 70%. https://www.sciencemag.org/news/2017/03/data-check-us-govern... Generally, the pattern has been that government and university funded researchers make the early discoveries, and then corporations do the research towards applying them. Universities benefit from patents, but the federal government doesn't.
But what we see sometimes (alternative energy, drug research, e.g.) is government funding of applied research, and that isn't good for the market or the science, and should be called out.