[cess11]

Maybe I'm holding TFA wrong but to me it seems like they're hinting at wanting a Prolog-as-database that could also become widely used, unlike actual Prolog.

It's not hyper-performant and mega web scale but the object database and Prolog like query language that comes with Picolisp is quite fun and sometimes rather useful, and has helped me think differently about how to model things in the default SQL database engines.

[procaryote]

It sounds interesting, although I have learnt both SQL and prolog and one was a lot easier

[cess11]

I'm actually uncertain whether you likely consider SQL or Prolog easier. To me both of them have a kind of late seventies feel that is kind of foreign compared to a lot of software stuff from the last quarter of a century.

Pilog is similar to both, the basics are kind of easy to learn, it's basically a bit of Lisp:ish syntax and keywords for 'give me a subset from these sets'. But it's a graph of objects instead of tables or atoms.