It's possible that some software did it on their behalf; I believe GPGTools submits keys to keys.openpgp.org, for example. (However, I don't know what the UI flow looks like, it's possible that it could be made clearer what.)
Also, the WKD draft has nothing to do with what's going on here. KOO is not the same thing as WKD, and is not in beta. It's a key server, and the concept of key servers has been around for ages. (WKD has been quite widely adopted as well, despite being only a draft, but that's an orthogonal discussion. It would definitely be better if it became an RFC.)
Also, the WKD draft has nothing to do with what's going on here. KOO is not the same thing as WKD, and is not in beta. It's a key server, and the concept of key servers has been around for ages. (WKD has been quite widely adopted as well, despite being only a draft, but that's an orthogonal discussion. It would definitely be better if it became an RFC.)