This title seems inaccurate. The article makes it sound like the data is just retrieved, from Microsoft, when using a specific editor. OSM doesn’t actually have the data nor are they are distributing it.
The current title here on HN which is just wrong is: Microsoft contributed 5PB street view data to OpenStreetMap.
(edit: my mistake, there is a license of sorts, see the comment below)
https://github.com/openstreetmap/iD/pull/5050#issuecomment-3...
Question 3 is the interesting part giving some examples of how they expect it to be used and an example of how it shouldn't be used.