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Well mobile data is very different. With fibre optic you can generally keep provisioning more cables and a single cable already carries a huge amount already.
Radio has an absolute efficiency limit for the bandwidth of a signal and we're pretty damn close to that now.
5g uses wider bandwidth channels, with more cells closer together and uses things like beamforming. But there's still always going to be an upper limit that is considerably lower than fibre.
This is why they likely want to discourage 5g becoming a full alternative to wired, because there's just not the capacity to do it on the same scale.