Good article, but I do not agree with a few points you made.
I don't think they would reduce rates if they were underwater and needed capital. That's illogical. Why would they want their biggest clients to leave if they needed the money? I think with this move they are reducing risk. 1000 clients with 1 BTC is much better than 10 clients with 100 BTC. Reduces systemic risk. Plus they are rolling out the card and other products so they are positioning themselves for masses, not for whales.
Having said that I didn't like their withdrawal process. Yesterday was the first time I tried to withdraw from their interest account and they flagged my withdrawal and I needed to verify my identity today. That is kinda silly in crypto world, when I already did that when I registered and I have 2 factor authentication and all the other bells and whistles. So this was a 1st red flag in my experience with them. Tho I do like that withdrawal is free.