Now with Monzo being the personal bank then maybe they could just send people a Happy Birthday message.
I know other businesses do this, typically offering a discount or some other way to try and sell you something.
I just think it would be nice to be a bit more personal and if they want to give a small discount on a sticker or shirt then thats fine but if not I think it might be nice to just wish you a nice birthday.
Thoughts? Also not particularly technically difficult.
Update: Could be an email or a notification, its the thought that counts