Most devices responding to inurl:viewerframe?mode=motion are running firmware from 2010–2015. These devices have unpatched vulnerabilities (e.g., hardcoded backdoors, command injection).
If you run inurl:viewerframe mode motion exclusive on Google right now, you will likely find 0 results. However, if you run it on Shodan (the search engine for internet-connected devices), you might still find legacy industrial cameras in factories running Windows XP with the Motion software installed from a CD-ROM in 2008. inurl viewerframe mode motion exclusive