SpaceKnow Machine Learning Engineer interview questions

The interviews consisted of three parts: first a meeting with Michael Reinstein, the head of research department, who is a very skilled and experienced AI expert. It was an informal chat of around 1 hour, very friendly. Second part was a "homework" for both thinking and programming, quite nontrivial. There was a lot of space for creativity in this homework and I liked it (the topic was cloud detection in satellite images). The final meeting was another chat, clarification of expectations and a common lunch with other members of the research group. After all of that, I got an offer with a fair salary, which I accepted. One week later the offer was suddenly retracted with the explanation that "the company board has changed its short-term strategy and decided to stop hiring in the research department". This doesn't seem to be very professional, and also raises some questions about their revenues / stability / planing etc.