But we don’t want all of the service. It’s like going into McDonalds for a coffee and being expected to pay for a few Big Macs and some happy meals for other people’s children.
You could say the same about Netflix, Sky, Amazon Prime - in fact, anything that you pay a flat subscription for. Amazon Prime also gives you the right to get the majority of what Amazon sells the next day, but I can guarantee that you will never order more than a tiny fraction of what they have for sale.
Your council tax means that you can go repeatedly to the tip with a car-load of rubbish, tens of times a day; you could read every single book in the town library, but you won't. If you aren't on a water meter, you can leave all your taps on full 24/7 and do whatever you want with Olympic-sized swimming pool amounts of water. But you don't want or need all that water, so you wouldn't dream of doing that.
Most subscriptions are based on the average/expected amount of usage. No one person is ever anticipated to want/be able to use 95% or more (maybe 99%+) of what's available, but the charge is based around the small percentage that you will use. You might as well demand to not have to buy a whole dictionary and only pay for the pages/words that you actually didn't already know.