It seems like this is aimed at use cases like a contact form hosted on something like GitHub pages - where you're limited to a static site, and assuming you don

It seems like this is aimed at use cases like a contact form hosted on something like GitHub pages - where you're limited to a static site, and assuming you don't want to run your own server side handler. I have one site that is generated by Gatsby that could conceivably use this instead of the php script I currently have setup to handle the contact form.