BioBots interview questions

I was presented with several long form questions for which they expected detailed, research report style answers. In all, I generated about 15 pages of responses, was invited for an in-person interview. They asked me for travel information and said they would purchase an train ticket for me to meet them at their office. I then heard nothing from them for several days, despite my repeated follow-ups, only to get notice 24 hours before the scheduled interview that they were going with a different candidate. I found the lack of communication and last minute changes very unprofessional.