It is a combination of things and certain specific events in my view. General issues are lack of training, no career progression whatsoever (the message these days is that you are responsible for your own career so they don't have to take an interest themselves), favouritisms, lack of responses and/or feedbacks (e-mails are no longer responded to, it really depends on who you are if you will get an asnwer or not even if the process requires an answer by the responsible persons; if you call someone and insist to get something out of them, in particular if they are decision makers at a higher level than you are, it can be very dangerous, they can be pi---d at you and can do everything in their power to cause issues like last minute rejections, no show at compulsory meetings, etc. etc.), no recognition (although they must have read now somewhere that recognition is a cheap way to increase retention and so they just started thanking people randomnly at the various all hands without really knowing who in reality did most of the work and should really take the credit), etc. However the worst thing I have seen in my entire career is when I was asked, after 3 years of pushing to move to a certain position, to do a personal development plan and I was told that, in order to move, I needed to "get along" with a certain guy. Was even suggested to reach out to the few folks that have a good relationship with this guy to get some advices out of them. I think that sums it up for me.