[xnx]

Roku has "Automatic Content Recognition (ACR)" which effectively uploads screenshots of what you're watching every few seconds: https://support.roku.com/en-ca/article/115005739288

Short of having an always on camera and microphone, this is amongst the scummiest corporate spying behavior out there.

[jp191919]

At least there is an option to disable it.

Edit: actually it appears to be "opt-in"