It's not open source at the moment, but I would consider it. Just have to think through it as once you go open-source it doesn't go over too well to go back. So, if I want to open source it, I want to be sure.

I'm sure some might like to modify it, though I think probably most people aren't developers and wouldn't want to.

There's no VCs or anything behind this, just me, and my costs are just a VPS to render the page, and all processing happens on the local device. So I have no reason to change any currently free features to ever not be free.