Apart from the other technologies that would revolutionize the world and the government finds a way to eliminate everything and then the inventor doesn't even know anything about him anymore.
At these times I remember Nikola Tesla. I know he contributed a lot to his creations, but some of his inventions mysteriously "disappeared".
Some would even help our lives today with free electricity, but the government would never let that happen, as they want people to need the state to live.
That is true. There is a lot of that by the US government. We are going to see less of it going forward.
People need to put stuff out open source so the government cant buy and control it.
Yes, it is true, as it would be a waste of many interesting and important inventions if they were not made available to the public.
They also bought up some (or just took them) and shelved them.