It's most likely the case that all western AV companies readily respond to National Security Letters and/or Warrants - providing the NSA/GCHQ with all the infor

It's most likely the case that all western AV companies readily respond to National Security Letters and/or Warrants - providing the NSA/GCHQ with all the information that they need. Kaspersky on the other hand, is probably more difficult for the NSA/GCHQ to secretly coerce, hence they need to exploit their software.