I vote with my feet and take my custom elsewhere, to other lenders if needs be. Monzo offers me the best banking experience so I stick with them as that’s what I want with a bank, the best banking experience.
Monzo have the data to work out if it’s worth them reporting to the other CRAs and it would seem the two they work with now are doing fine. They only reported to one for years, and everyone moaned so they reported to two. It’s why I’m fairly sure they’ll soon be reporting to all three, as the customer base grows to 10 million, there will no doubt be more cases (maybe). Or maybe those troublesome lenders will start getting their data from another CRA… who knows. Unfortunately I don’t have a time travelling device to tell me.
As you’re after an official word from someone that works for Monzo you’re in the wrong place on a forum. As I said above, in-app chat would be your best bet, or even shoot then a tweet.