To get them to stop they need to lose both the original sale and the additional advertising revenue. Right now their thinking is:

• People are buying our TVs
• Putting advertising on them isn’t causing our sales to drop
• Therefore it’s costing us next to nothing to do.
• It often gets us extra revenue if they connect to the internet.
• If they don’t connect, we still more than covered our costs.

There is no downside for them. Only upside. The equation needs to change for them to stop doing it.