Any CDN or shared hosting provider could implement this same standard. The only way it's truly useless is if a web site has its own IP address / small set of IP addresses.
(Or if the user isn't using some form of DNS privacy like DNS-over-HTTPS/TLS, but then their domain connections are exposed regardless of whether their CDN/host implements ECH.)
(Or if the user isn't using some form of DNS privacy like DNS-over-HTTPS/TLS, but then their domain connections are exposed regardless of whether their CDN/host implements ECH.)