This is not the case for 4g since the much lower frequencies (with much lower data rates) go much further meaning that the given last mile monopoly in an area has less of an effect on the 4g service.
If a cell phone carrier builds all of its own infrastructure to supply bandwidth to 5g towers, they are subject to all the same difficulties and delays as existing ISPs. This means that build out of 5g as fast as home internet will take decades and many areas will have only one or two options (same as the situation is with home internet).
The waters are muddied by the fact that carriers use “5g” to refer to what will be a wide range of service levels, but right now are only hyping the fastest possible imagined deployments.
It’s more than that, but even there you’re talking about covering 9 houses for the cost of wiring up one. The fan-out math kills you for FTTH.
In the case of regular cellular service, is the IP publically accessible, or is it behind a NAT of some sort? I always assumed that it was behind a NAT for some reason, but I don’t know for sure.
I like to be able to host my own services for personal use.
All that said, I'm hoping wireless solutions change this scenario. Effectively, if I can run a 5G (or w/e) hotspot connected to my router, the latency/throughput is good enough, I'm pretty much cool ditching my wired options. A monopoly on the wireless side is still possible (spectrum can be a limiting reagent), but I think it's much less likely to devolve into our current ISP dynamic. I'm certain there are plenty of technical issues with going all wireless but it doesn't seem insurmountable.