This makes me think of the anti-spam blacklists that intentionally list entire netblocks as spam, to intentionally inflict collateral damage on the ISP’s legitimate customers in hopes of pressuring them to remove spammers from their networks.
I installed the FTDI drivers on my Mac to try and get the RFduino working (but I think in the end it turned out to be a problem with Arduino IDE versions.) Very pleased I uninstalled them. Do you think they pulled this stunt with the Mac drivers too?