I must admit I do not follow the Royal family that closely, but I feel like this situation is pretty complicated.
To me it looks like they have things they want to do as a couple (I doubt it is about money as they would not ever want for money as senior royals) and their Royal commitments are getting in the way of those things. Harry is never going to be King, so knowing that I can understand wanting less Royal commitments as he really is not that relevant to the Monarchy itself.
I do think it has been handled extremely poorly though. This should have all been sorted out before any kind of Instagram announcements were made.
Megan does not seem particularly likable to me, but I don't know her from a bar of soap. Her family on the other hand seem WAY less likable. Her Dad seems like a total leech, and her half sister is an absolute attention seeking mole. I would distance myself from both of them as well.