The street views generated on this site are not really random; they are picked from a predefined list in a db. This is why duplicates appear after a number of clicks.
I run http://www.mapcrunch.com which also generates random street views, but with more options - you can define a region on a map (like a city) and generate street views from within it. You can also restrict the generated views to those taken within buildings, or within urban areas. The views generated are also totally random.
I don't have any objection to someone copying the concept of an existing site / service, but I feel that if you do so, you should at least try to differentiate it in some way - most easily done by making improvements or including superior functionality.