Do you redirect to Monzo or another card?
For me Curve is a security thing. I can leave it on the Curve setting so nobody else can spend with it if they find it. I switch it to use a card when I do want to spend. I can switch it to different cards at different times depending on balance in account or if I want to use a personal or business card or a GBP or EUR account etc. If I lose it I can still use those accounts with their original cards, had I not had Curve and lost original bank cards I would not be able to use those accounts until a replacement arrived. Plus retailers and other shoppers can’t tell if I have a premium account at Coutt’s or a basic banking account at NafWest.
I have Monzo and other banks cards linked. But I prefer to use my real Monzo card so expenditure on that account is automatically categorized which it would not be if spent via Curve. But it great when used with a non-Monzo type bank
I had sufficient failures with curve that I ended up carrying all my other cards anyway, so the security benefits eluded me!
I was forever forgetting to switch it to the right card for the task too.
So I went back to my separate Amexen for business, personal etc and mondo for the fun of seeing it working