Street View itself has been around since 2007.
What is "a street view service" other than Google Street View?
Bing has a similar service called Streetside. I can't find any usage of the phrase to mean anything other than Google's service.
Mapillary uses the phrase "street level photos"
It is a registered trademark as well: http://tmsearch.uspto.gov/bin/showfield?f=doc&state=4805:dq9...
I think in a dispute, Google would very likely win.
In the US. But OSM doesn’t have to care about that – the worst that could happen would be them being banned from doing business in the US, or their profits being seized.
Which is no risk to them.
It's run by the US company Telenav (all over the terms: http://openstreetview.org/terms/ ).
I guess individual users are giving OpenStreetView/Telenav some permissions via OpenStreetMap oauth.