1c/GB would be a decent rate for home data transfer in 2023, but where would you set the free limit? For reference, at my house I have a 1Gbps line and it looks like in 48 hours I have downloaded 1TB of data (looking at the number of received bytes my AT&T device is reporting). Am I normal? I don't know, but AT&T does...
I think that's rather high compared to average, considering the standard cap for Comcast Xfinity residential is 1.2TiB per month, and they claim only "a very small percentage" of their customers use more.
I don't think the actual cap really matters if the per-GB and base pricing reflects the true costs. If it's low it means heavy users pay more, if it's high, light users pay more.