I downloaded a icon off of bing search, and used it for a cursor build on CursorFX. The license for the icon says it can be used for non commerical use. At first I thought, ok, fair use, right? No money changes hands, so I can use it for a cursorFX file, but then it occured to me that the cursor would need CursorFX to be installed, and since CursorFX costs money, it might turn out to be a commercial thing. Or am I overthinking things? The icon that I was think of using is a rainmeter icon, such as this: 

However, since I am being careful not to step on any toes in regard to licensing and fair use, I thought I would post this to see what others have to say.