Every time I buy something from the PlayStation store on my Monzo card I always immediately get a Monzo notification saying that purchase will now be predicted as a monthly subscription. I then have to go in and turn off the Repeating Payment switch on that transaction.
Every time. It’s maddening.
I agree, a toggle would be nice somewhere 
Starling do it too 
Edit: I think if you change the topic to Feedback and ideas people can then vote 
I don’t want customers to vote on it. I want Monzo to fix it.
Given it rarely comes up for discussion, you’ll be waiting a long long time as a guess. It could well be on someone’s list to look at but higher priority work is taking place instead.
Oh I know that - just like I know that putting it up to a vote won’t get it fixed any faster.
FWIW, I would’ve given this a vote, I agree it’s super irritating.
Personally don’t think it’s a “fix” as it’s not broken, it’s a predication of what may be charged again next month.
Just infrequently annoying as expressed in your example.