We switched to ufdbGuard recently and were a bit confused on that point as well. But see: https://www.urlfilterdb.com/products/ufdbguard.html
"ufdbGuard is copyright-protected, but free for use. Also in commercial environments."
The pricing page and licensing model you have linked is only for their blacklist database, "URLfilterDB", which is subscription based (and worth considering). But you're free to use the ufdbGuard software with other blacklists. It imports and works flat file based blacklists like Shalla very well.
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