10% equity isn't much and wouldn't influence Intel siginificantly but if they wanted to embed spyware in the CPUs they don't even need to acquire any stake in it and probably already would have done so. All Intel CPUs for sometime now have been running Minix, it would have been easy for them to do so all along without doing so in the silicon directly. Plus Intel introduces security exploits in the CPU by themselves without the US government demanding it.