I no longer offer AI files
AI (Adobe Illustrator) files are proprietary to Adobe. They are a version of vector files, but a limited version. AI files are strictly limited to subsets of EPS formats.
SVG files are XML-based, meaning you can edit them using both a text editor and an image editing program.
SVG files are better than AI files
Adobe Illustrator can open SVG files
Adobe Illustrator is the only application that can make AI files
Adobe Illustrator is extremely expense
It is not cost effect to maintain an Adobe Illustrator subscription to make inferior files when I can make SVG files