From What Can't I Build?, this isn't "code-free programming", rather it's code-free web app building. It's still very powerful but not the same thing as coding.

  "That said, there are some limits to what the core language can do. Bubble’s language is comparable in power to spreadsheet formulas: you can do a lot, but anything requiring recursive or looping operations on data (such as, for instance, writing a custom machine-learning algorithm) would be difficult."

https://bubble.is/faq