Is my potential phd supervisor ethical? I am an international student from an Asian country. I recently emailed one PhD supervisor at a well-ranked university in London with my CV attached to see if there are any PhD opportunities for me. The supervisor replied to me very quickly and invited me to have a Skype conversation with her.
She only asked about my research interests but nothing else during the Skype chat , which I actually considered as an informal interview (she even didn’t introduce her lab to me). After the Skype chat, she asked me to write my own proposal and proceed with the formal application, which made me to think at least she was happy with my application. After that, I drafted a few research ideas and sent them to her. She finally agreed with the ideas and edited the proposal for me for a few times.
From sending her the first email to finishing the research proposal, it took me around three months. We had more than 20 emails and one more Skype chat during that time. As it was an extremely complicated and tiring process, I think the reason why she continued to help me with the proposal was because she wanted to take me as a student. Otherwise, she can say no in any stages during this process.
The requirement of the university is to have a formal interview for all prospective phd student. The interviewer was the phd supervisor. However, I was rejected by her after the formal interview, which I couldn’t understand at all. If you want to reject me, why did you spend so much time on me and give me false hope? I just think this is not very ethical, as if you said no earlier, I would have had chances of finding other supervisors in the same university (I really wanted to get into this uni, the supervisor was actually less important).
So I am wondering here how you think about this supervisor (i.e why she rejected me in the end while writing the proposal with me during the past three months) and if this is normal in Western/UK culture?
Here is another perspective: a professor offered you substantial help with your application and you end up complaining that they wasted your time. Trying to figure out whether you’d be a good fit, they discussed research with you  at length and help you draft a research proposal (which you hopefully use to improve your acceptance chances in other applications). After several days (or weeks) of discussion they decided that you’re ultimately not a good fit.
There can be a million reasons: another student was a better fit, funding was denied, research needs changed and so on. Rejection sucks, and I do sympathize, but it sounds like the professor went waaaaay out of their way to help a stranger; their reward? Getting trashed online for it.
Your lesson from this should be to not place all your chips on one advisor so to speak. When I interview candidates I implicitly assume they’ve applied to at least 10 other places and discussed their work with others. I had prospective students and research fellows rescind my offers after I had invested a ton of time and effort into getting them admitted. It sucks, but that’s life.
Edit: seeing the discussion in the comments regarding foul play, I don’t think that’s likely. While there might be a chance of that, think about it - why would anyone not want to hire someone who has great ideas? I don’t see the causal relation here. Coming into research with a non-cooperative mindset won’t help you in the future.