The base models are licensed under CC BY-SA-4.0 (not CC-NC).
"You are free to copy and redistribute the material in any medium or format, remix, transform, and build upon the material for any purpose, even commercially."
Oh, it shouldn't be the case. But anyone can easily finetune the Base model on the same datasets in a couple of hours on any consumer GPU with 8GB of VRAM and release it under the commercial license (using https://github.com/johnsmith0031/alpaca_lora_4bit).
"You are free to copy and redistribute the material in any medium or format, remix, transform, and build upon the material for any purpose, even commercially."
https://huggingface.co/stabilityai/stablelm-base-alpha-7b