The phrase "inurl:viewerframe?mode=motion" is not just a random string of text. It is a specific search string, known as a Google dork, used by security researchers—and malicious actors—to find unprotected network cameras connected to the public internet.
The term viewerframe?mode=motion is a common URL path for older network-connected cameras (IP cameras). When these cameras are connected to the internet without a password, Google’s bots may index the live feed. inurl viewerframe mode motion bedroom top