Basically, yes! Since the fundamental functionality is powered by my (free) open-source library, trianglify.io is a time-saving tool for those who want a quick GUI instead of having to download and learn the npm library.
It's part of a series of experiments that I've run on monetizing open source, which you can read about in the article I wrote a while back here: https://medium.com/@qrohlf/i-sell-triangles-on-the-internet-...
That said, right-click > save as image is supposed to be disabled on that particular DOM element, but I'm guessing you probably have an extension or user-script that re-enables it. Which is fine, you're probably not the target audience for this! Trianglify.io is mostly used by designers working on professional projects for whom $8 to save 20-30min of tedious work in Illustrator is a very good value proposition.