Chinese Smart TV Collecting User Data

Skyworth smart TVs scan Wi-Fi networks every 10 minutes without user consent, uploading data according to a protocol. A user discovered this by analyzing the TV's backend code, revealing a program by Beijing-based Gozens Data that tracks activity on and near the TVs. Skyworth denies privacy intrusion, claiming data collection is for personalized ads. Gozens' service covers millions of households and devices in China. The prevalence of smart devices raises security concerns among users.

According to the text, how many households does the data collection service cover?

What types of devices are mentioned as being increasingly linked to the Internet in homes across China?