Study: content delivered via some streaming devices keeps playing when TVs are off, with 17% of ads shown when users can't see them, costing brands $1B+ a year (Wall Street Journal)

Wall Street Journal:
Study: content delivered via some streaming devices keeps playing when TVs are off, with 17% of ads shown when users can't see them, costing brands $1B+ a year  —  Lack of communication between TV sets and streaming devices causes estimated waste of over $1 billion in ad dollars