This sucks -- not all Mastodon instances will be able to use this. It's subject to approval by keybase, ensuring only big instances can use this. A step backwards a proper decentralized network…
They already somewhat said that porn related instances will not be allowed. So sex workers and such won't be able to use this. Why bother asking them?
I moved to the fediverse to NOT be controlled and regulated by corporations, because there's no need to. Adding such a feature in Mastodon is stupid. What's the next step? Integrated Twitter client?
Keybase has said porn related names / IDs won't be allowed? I was going to suggest some people look at using it as an alternative ID system to use in various chat systems. However some of those appear to be sex chat focused, so if that could cause an issue for them I'd be better off not mentioning and looking for a keybase like ID alternative.