OSM is kindly allowed to use bing's aerial imagery to trace from it. See [wiki](https://wiki.openstreetmap.org/Bing_Aerial_Imagery). Bing belongs to Microsoft. There are other permitted imagery providers - just see the selection list in your editor.
I (with [uMatrix](https://github.com/gorhill/uMatrix) in Firefox) when using the iD editor on the website do not need to allow JS from that domain - just images if I want to see the aerial imagery (of course). If you struggle with the website-builtin editor, just use [another editor](https://wiki.openstreetmap.org/wiki/Editors) (e.g. JOSM).