You're right, sorry. Redoing the math the impact drops to ~$26,000 saved per day. I wouldn't call it nothing, but you're right about it being much, much less.
A base iPhone 14 is 3,279 mAh. At 120V that's 393.48Wh. National average cost of electricity per kWh is $0.16, so charging an iPhone costs about $0.06. Apple doesn't publish exact sale figures, but we can assume sales at least matched the iPhone 13, take away 10 million because the iPhone 14 is newer, assume about 40% of that is US, and you get about 13 million iPhone 14s in the US.
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Theoretically, this saves ~$2,080,000 of energy in the US alone. Factor in other phones and other markets, it can easily save significantly more. Obviously, this is still a drop in the bucket compared to total energy use, but it isn't as insignificant as you might think.
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Edit: See replies, did the math wrong. It saves ~$26,00 per day.
Final image from DART with person for scale
PM_CTD t1_ja6n4u2 wrote
Reply to comment by crazyk4952 in If you noticed your iPhone is charging a little slower it may be due to a new setting Apple added in iOS 16.1 — Clean Energy Charging. With it turned on, iOS will only recharge the iPhone's battery when the electrical grid uses cleaner energy sources like solar or wind. by RonSwazy
You're right, sorry. Redoing the math the impact drops to ~$26,000 saved per day. I wouldn't call it nothing, but you're right about it being much, much less.