605
Realtek's $10 tiny 10GbE network adapter is coming to motherboards later this year
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
There are multiple ISPs that offer 10Gbps Internet service in Japan and South Korea, I imagine other densely populated cities might have them also. There is also the Swiss ISP that offers 25Gbps Internet service since 2021.
Though I agree it is probably more used for LANs.