I understand your concern. We also provide a npm module that could be launched on any server. And for what it's worth, the iframe displays a checkbox to disable calculation by your browser.
BTW, the script to be included is a bit buggy, we're short in time. Now that votes are finished, we'll open source everything and continue improving it :)
Sounds like a dangerous suggestion. I certainly do not wish to join any grids while reading some random blog.