Short answer: Yes — in 50+ cities on TenDollarPick, $10/day is realistic. Outside those cities, plan $20-30/day minimum.
$1-$2 tier cities (Bangkok, Hanoi, Mexico City, Bogotá, Cairo) allow $10/day with discipline. $3-tier cities (Tokyo, Singapore, NYC) need $20-30 realistically. $4-tier cities (Paris, London, Reykjavik) need $40-60 for comfort. TenDollarPick is a game — but the ratios reflect real costs.