Increasing by ~2k steps (~1 mile) per day =
An extra ~100 calories burned for a 180 lb. adult
An extra ~85 calories burned for a 160 lb. adult
An extra ~75 calories burned for a 140 lb. adult
While these are rough estimates, and not exact values for calories burned, this still demonstrates the powerful influence of daily steps (a part of NEAT) on TDEE. If a 180 lb. adult was only getting 2k steps a day and increased this to 10k steps a day, that's an extra 2,800 calories burned per week. That's nearly 3,000 extra calories that individuals could consume weekly to maintain their weight!