The NSA is investigating how it will spy on internet-connected "smart" gadgets and appliances in the homes of people who make the mistake of having such things.

If the device has proprietary software in it, it does not deserve to be trusted. The software's proprietor might design it to snoop on you or mislead you. However, even if the proprietor doesn't put in a malicious feature, the software is likely to have security flaws, and users won't be allowed to release corrected versions for you to install.