Pizza Photo Editor is still early-stage -- we're still adding features and increasing the coverage of different object classes in our training data set -- but the core tech is there, and it does have an interactive web UI, so it's already fun to play with. :)
Looking at the example inputs & outputs for ObjectCropBot, it's evident that the challenge is not just detecting the object and clipping it approximately, but tracing a tight precise boundary around it. We've found that DNN/ConvNet-based approaches don't offer the necessary precision, so it's necessary to perform some pre- or post-processing using other Computer Vision techniques. At Object AI, we've developed an "object boundary deduction" pipeline that combines ConvNets with other tech. It's interesting that the blog post that you've linked to makes the same observation!