iOS / Mac updates are humongous. 100+MB per webview-wrapper app. And they aren't sharable. iOS 18.1 today was 8GB. How many Apple devices do you have?
Every website these days starts to automatically play videos, with no way of disabling that (looking at you Fandom, and until recently, Ars Technica).
All video is consumed in a streaming manner. At least when you watched a movie over cable it didn't consume bandwidth. But when you watch the same movie on YouTube TV it is counting towards your 'limits'.
And you cannot set proper limits, as they calculate your usage once per day. Go over, $10 per 50GB on Cox. And your limit is 1280GB, even on their 2Gbit connection.
So unlike with your car where you have a pretty decent view on when it's empty, and you can fill up at almost the same price as the previous tank, here you're screwed twice, once because you can't measure, and second, because the price is outrageous.
For a 2Gbit connection, you can actually go through your limit in ...
2Gbit = 250MB / sec. 1280GB = 1310720MB. 1310720 / 250 = 5242.88 seconds, or 1 hour, 27 minutes and 22.88 seconds.
Insane. We need more competition.