This is true yes, but there’s a very good example here on this forum of a user being empowered by the data and notifications Monzo provide to fix a problem before thousands of pounds left their account. Most other banks will only tell you after the payment has left.
If this is technically possible, I really hope this doesn’t happen. We already have enough issues with airlines and petrol stations trying to block the use of Monzo, we don’t need more companies blocking the Monzo sort code because some people are declining their direct debits.