Sage interview questions

I had two successful interviews, one on technical and one on programming questions, but then they made a strange request for me to do a 3 hour on the spot data science hackathon while being observed by their junior d sc employee and a manager. I dont appreciate such requests to be observed by being looked over the shoulder in an interview before I am fully employed and being compensated for training a green employee of theirs, so I suggested I can do that d. sc. contest off-line in the same time amount and return the contest by email. I never heard from them again. This UK based company has interviewing practices that US companies would not observe, as I feel it thinks that a prospective interviewer can be subjected to any kind of abuse or demand work from the interview simply in hope of getting a job with them. In other places, such work would be a consulting assignment being paid for that many hours of data science work.