I don't think anyone can say that really, silica/other built from ground up elements, sure, but is there a backdoor in Linux kernel is the million(billion? trillion? considering their budget) question. Still my trust is rather in non-US based company

Edit: forgot to mention, answer 'no' is an extremely welcome thing, with the lawyering/NDAs and what not, try to find same clear answer from any other company, "we do not currently spy on chancellor", "NSA has no direct access to our servers" etc