I bought a Dropcam when they were a new thing. When I realized they did literally everything via a cloud service and would be a brick without that service, I was furious. The incredible arrogance of a company making a webcam that sends your video to their servers, and provides no means to use the camera in a secure/local fashion, was astonishing to me. I still can't believe something like Dropcam is such a huge succe…
To your point about it being a brickable device... I figured by the time the product was "bricked" (e.g. company going bust, product end-of-life, etc), that the hardware would be so out of date that it'd be time to replace it anyway.
With that said... after Nest acquired them, there's been no new meaningful features, no decrease in price, no new camera features, etc. I cancelled the "DVR" plan and will be finding an alternate system later this year.