You'll get blowback either way, the only difference is that in one case it'll be because your app was compromised and in the other case it'll be because someone doesn't see a difference between slopcoding the entire app and using it as a second pair of eyes in a limited, and human validated, context.
I think that LLMs for coding is both terrible practice and environmentally costly, but I can see this sort of usecase being beneficial. Trying to find a model that's only been trained on open source code, and that runs without a huge environmental cost is tricky though. You really don't want the risk that some proprietary code has got into the training set and it gets regurgitated for you. There's been way too many court cases over a few lines of code being copied.