> Fast-forward some number of years (...)

I repeat: OP's home server costs as much as a few months of a cloud provider's infrastructure.

To put it another way, OP can buy brand new hardware a few times per year and still save money compared with paying a cloud provider for equivalent hardware.

> Regarding the equivalent EC2 instance, I'm not comparing it to the cost of a homelab, I'm comparing it to the cost of an Anthropic Pro or Max subscription.

OP stated quite clearly their goal was to run models locally.