But if Google decided to put a chip in their computers of their own initiative, then that's not an indication that the other computers have a chip. So I feel I'm much safer.

I care about my rights. If computer manufacturers lose their right to design their products as they see fit (i.e. they're forced to install chips against their will), that means the government is severely limiting its citizens' rights. There is likely no hope for my freedom. But if a manufacturer puts a chip in of their own free will, that's not really infringing my rights. I can simply buy computers from a different manufacturer.