My day job is building ISP networks. It’s been about 20 years since I had a home connection that I didn’t configure up both ends of myself.
I’ve got a 1G / 500M tail into home where I am right now, not that that is particularly impressive. One of the jobs I’ve been putting off at work is standardising our usage of the 10G GPON platform available here in NZ, when I do that I’ll get one of the >1G tails to use at home.
Usually the answer is how ever much I can be bothered building, but my usage is pretty low.
We did an address check when we could first order it and about a third of the folks in the office could get it about a year and a half ago. I know the majority of the address checks that we do for commercial locations in tenders come up positive now.
It is not cheap to get an off the shelf router that does a solid job of forwarding multiple gigabits and the vast majority of folks ( me included ) probably will rarely notice the difference outside of speed tests. The last firewall build that I did for home was with a pair of virtual Linux boxes with 10G interfaces just so I could do a 2G or 4G GPON upgrade later on without having to throw everything out.
In New Zealand it seems like 10G GPON services are mostly cannibalizing high quality lit ethernet services at 1G and 10G subrate rather than replacing consumer tails. So more likely a business is going from spending $1500 a month on uncontended 1G to spending $400 a month on contended 4G, rather than a residential user going from spending $150 on 1000/500 to $280 on 2000/2000.