Thanks for this suggestion. We want to make it clear that Fair Source is not Open Source. We've updated the summary in the header: https://fair.io. Hope this is clearer!
Fair Source never works like an Open Source license. It works like (because it is) a source-available proprietary license which allows local (but not redistributed) modifications. Below the use limitation, it is also a free-of-cost license. But it never works like an Open Source license, and it doesn't even work more like an Open Source license below the Use Limitation.