Well, they've been successful in that they seem to be far ahead of any other self-driving company* in putting level 4 vehicles on the road carrying paying customers. Whether that pans out as a viable business of course remains to be seen. (Although I expect it probably will be economically viable, and mainly a matter of getting the public to be indifferent to fatalities the way we are for human drivers.)

* I think maybe Mobileye is the nearest while being pretty far back, but I'm not too familiar with what's going on outside the US.