That's generally not true. US cable and satellite operators are only required to carry the "primary" video feed [1], which is usually the xx.1 channel. In most markets, home shopping channels typically air on subchannels (xx.2, etc.). The exception, of course, would be if the TV station designates the home shopping channel as their primary channel.

Home shopping is usually used to monetize excess bandwidth.

[1] - https://www.ecfr.gov/current/title-47/chapter-I/subchapter-C...