It seems to be the policy of many, if not most organisations now to offer a free trial, which will automatically renew on expiry. It would be great if the Monzo app could be set to let you know a day or two in advance before a direct debit is due to be taken.
It would also help with longer term bills. My phone contract for example tends to fluctuate the amount (last month it came out as double the usual by mistake) it would be great if the app could let you know before the money leaves so you can deal with the problem early rather than having to chase, in this case Vodafone, to return your money - a process which often takes days or weeks.