My only issue with this project is that, after navigating the webpage for a while, I can't see _any_ reference to open source software, and compliance with their licenses.

They should at least put a link anywhere in the webpage, where people can click and at least be redirected to their components.

I know compliance is about "you only provide it if asked for", but they could be a bit more proactive and _embrace_ that they are using FOSS, not merely try to sell it.

By the way: How does selling of the Pro version work with GPL? Or is it covered because they offer the Core version?