I’ve had instances in the US where I’ve set-off with more than enough money for the trip and I’ve had to access cash from elsewhere because I’ve ended up with so many holds and charges on my card which then reverse, which is fine, but there’s a period where you can run low on money.
e.g. I check into a hotel and they take a hold on, say, $4,000 for the stay. They then stick a hold on $500 a day to cover incidentals, of which I have very few because I’m off spending $500 somewhere else. So now I’m down $10,000 after 6 nights. Then they charge me $4,000 for my stay when I check out, but the holds don’t fall away immediately, so I’m down $14,000 even though I’ve only spent $7,000. Then I head somewhere else and I’ve no cash so I have to take it from elsewhere and a few days later I get the money on hold back, but by then I’ve been hit with other holds. It’s a mess. It’s like you need $16,000 to spend $8,000.