Keybase seems like something that should be small, isolated, FOSS, supported by a foundation, etc. They could have built a business _around_ Keybase I'd imagine, but all they managed to do with this is invalidate Keybase and make people like myself, who feared their business motivations, feel vindicated for being paranoid.
I'll never blame anyone for wanting to make money, to make a business, etc. But if you make a product that walks talks and acts like a FOSS project, but keep it to center your business around... I'll always be longing for a real, true FOSS replacement.
In this case a good looking FOSS alternative came out a few months ago iirc. Though for the life of me I can't remember the name.
edit: https://keys.pub/ - though I will still miss KBFS