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Kagi Introducing Fair Pricing
(kagi.com)
This is a most excellent place for technology news and articles.
FWIW - most mobile data plans roll over if you don't use them fully during the month.
(at least where I live)
Kagi is rolling this out to people who never use their service. So that would be equivalent to you paying your mobile provider and never making a phone call or text for an entire month.