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I don't think taxpayers should be paying to start car and rocket companies, or to build them factories or spaceports, how was my answer unclear on unserious?
If billionaires want space ports and to build rockets let them use their own money or private capital. If it was a good investment private capital would fund these projects, but private capital expects actual returns.

I don't think taxpayers should pay for public education.

If billionaires want space ports and to build rockets let them use their own money or private capital
best I can tell that's exactly what Elon Musk (space X) did in brownsville. His other three spaceports he leased from the government.

Using money he got from taxpayers to rent space that taxpayers took a loss to create. He is like a welfare queen cashing in his food stamps to pay his portion of his section 8 housing.