The string is a well-known "Google Dork" used to find publicly accessible Axis network cameras that have motion-JPEG streaming enabled. When combined with keywords like "hotel," it specifically targets unprotected security feeds located in hospitality environments.
Stay safe, and stay private.
Hotels are particularly vulnerable to this type of exposure for several reasons: inurl viewerframe mode motion hotel link
inurl:viewerframe?mode=motion + your hotel name. You might be surprised at what you find.