I have lived in china for a long time now and I have to say monzo is the only banking app not requiring a VPN to get push notifications or even log in. Even HSBC is blocked. Monzo is a life saver for this but go knows how they seem to be the only UK bank not blocked. Oh amex app is also not blocked which is good too.
Just want to point out that this is absolutely not true so people are not misled. Monzo, along with most major UK banks, work absolutely fine in China. Barclays, HSBC, RBS, Starling and NatWest definitely work.