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What makes pay-per-use pricing inherently more or less fair than unlimited usage from a subscription?

I don't use much, so for me this is not a good deal - I'd pay for "unlimited" usage, but make just a few requests daily..

So those who use less pay for those who use more, and I don't see it as a fair deal.

BTW, Grok 3 will be available on x.ai in coming weeks.