The study found that 10 percent of the UK population, around 4.9 million adults, currently have access to platforms such as illegal fully-loaded Kodi boxes, Amazon Fire TV chipped sticks, and illegal streaming apps on smartphones and tablets.
This is putting significant pressure on subscription services, with one in seven users of the platforms, around 830,000 people, having already cancelled at least one subscription, and almost a third, 31 percent, planning to do so in the next 12 months.
YouGov also reported that use of pirated TV streaming services is high among younger people. Those aged between 18 and 34 accounted for 37 percent of users (1.8 million people).
“There is a real danger that having got used to getting TV services for free it will hard to convince them to pay in the future,” wrote Russell Feldman director of digital, media and technology at YouGov.