That's a very interesting idea, gotta think about it. Anyways, thanks all for your input. I should have probably not disclosed anything about the interview, but had a couple of beers and darn thing exactly when I shouldn't talk I feel more talkative.
Well, the interview went surprisingly well (from my point of view). Like they get default kudos for doing a human-involved interview, meaning burning the time of one of their own while I'm burning mine, instead of throwing me the disrespectful and message-sending approach of an automated Codility or Hacker Rank thing. Which says "we only hire the bottom feeders who are willing to put up the time, effort and futility of memorizing several Universes worth of useless stuff and regurgitating it in perfect timing and condition before the examiner, that is of course, before forgetting it all and nevertheless not understanding a bit of it in the first place". So they definitely weren't that type of shop. I solved all problems eventually and got to the free talk phase and that's where the things got tricky as I both got the feeling he's trying to milk me for info without an intent of further pursuit and I've had the feeling there's not much room to do the same thing in reciprocity. So undecided (i.e, 99.98% rejected).