Given that it's still fairly new (just coming out of draft in the coming months), no, it's not, but it is _in_ use, and it can be deployed by server operators a

Given that it's still fairly new (just coming out of draft in the coming months), no, it's not, but it is _in_ use, and it can be deployed by server operators and client devs in its draft state. With low adoption comes the risk of flagging by bad actors on the network, but hopefully that goes away quickly after ECH comes out of draft. The silver lining of having so much of the internet controlled by massive, monolithic actors like Cloudflare and Google is that when they flip the switch on ECH, it'll be widely in use within weeks or days, not months or years; and while I don't keep up with Google's involvement, it does seem like Cloudflare's been active on the ECH front with the IETF.