Apple has over 2.3 billion active devices of which a small percentage are Macs (an estimated 24 million were sold in 2024 and around twice that in iPads).
The most difficult to scale part of a cell network is number of devices connected, not bandwidth used anyway and cellular Macs aren’t going to add significantly more load to a network. And that assumes that Apple even cares what a carrier thinks.
I’m in Australia, not the USA, and for all people like to complain about internet here, we have excellent mobile coverage and it’s relatively affordable, but it’s all priced by usage.
I have 4 devices on my plan with shared 210GB of 4G usage between them for around AUD$200 (USD$130) a month on Australia’s best network (Telstra). I work remotely from cafes a lot (probably around 20-30 hours a week) as a developer and get nowhere close to that usage. I update all my apps, download all my podcasts, listen to lossless music and stream video whenever I want during breaks (although I’m not a huge out-of-home video consumer). I do literally nothing to limit my bandwidth usage and am lucky to use 30-40GB a month across all my devices.