The tool is provided under the MIT license. This means that you can use it for both non-commercial and commercial work, for any kind of project or purpose, without limitations for you and without liability on my part.
The MIT license’s only requirement is that you credit the tool, i.e. mention that it has been used in your work. This is typically done in some credits or description section. For example,
- If you sell your music, there is probably a product description field somewhere where all third party credits can be given.
- If you create music for your own game, there is probably a credits screen where all first and third party contributions to the project are listed.
- If you create music for your own video, credits are typically given at the end of it (like in a movie) or in the video’s description.
In case you sell, or provide for free, your music to the general public, that’s none of my concern at that point. What kind of license, limitations, and requirements you put on your work is up to you and is between you and your customers.
TL;DR: If you draw a picture in Photoshop and then sell it to someone, that someone doesn’t enter into relationship with Adobe. Likely, they won’t even know that you’ve used Photoshop. Same here.