None of these are the same comparison. There is no “wasting” Internet speed.

The comparison would be better to turning on the faucet halfway to fill your cup slower. What’s the point. You’re using the same amount of water. Just open it all the way and fill your cup.

The cup doesn’t keep overflowing with data. You’re downloading files, once those files are done downloading it’s done. It’s not like it “forgets” and accidentally downloads the whole internet. What a weird way of thinking the internet works