"Some" is doing a lot of work in that sentence. Subscriptions are structurally designed to extract payment for non-use. the whole point of the model is to be predatory.
You pre-pay for some allotment of resources but get nothing back for unused resources. And the main profit comes from the gap between what you paid for and the actual usage. And that's just in the best case scenario there the company is not running at a loss just to squeeze you later even harder. The entire model only works if people throw their money into the void.
If a provider genuinely wanted to cover the costs my usage imposes on them, they would bill me for usage. That's the honest version: you used X, here's the bill for X. Instead, subscriptions deliberately decouple what I pay from what I consume, and they always decouple it in the vendor's favor, never mine. I never (well i think Kagi[0] actually is different, one outlier) get a refund for the month I didn't watch anything or the API calls I didn't make.
[0]: https://getlago.substack.com/p/why-kagi-launched-no-use-no-p...