Yes as I said in a sibling post the telcos are the only ones using it, and that is the only reason that graphs like the google client one exist. That is only because it already exists and is cheaper than using NAT when you have hundreds of millions of clients.
IPv6 only ISPs will never leave the mobile space.
“The largest ISPs are the only ones using it” is another way of describing it as ubiquitous.
Maybe in the US. I've seen IPv6-only connections via DS-Lite in more than one other country on wired home ISPs.