I think the confusion mainly comes from the fact that the MIT license applies to the NDISAPI project source code, while the Windows Packet NDIS drivers have separate licensing terms for commercial use. So, being MIT-licensed does not necessarily mean every component associated with the project is free for commercial deployment.
For a small business, I would recommend confirming exactly which components your application will use and whether a commercial license is required before committing to the project. It may also be worth contacting NT Kernel directly to ask whether they offer a small-business or startup-friendly licensing option. That way, you can understand the actual cost and avoid any licensing issues later.
