If Keybase acquired Zoom (haha), then, sure. This is a PR move for a public company. They'll probably gut Keybase, move their Chinese server generated AES128 keys to AES256 keys generated by you and uploaded to their Chinese server, then call it a day.
I can't think of a single instance where acquisition of a smaller company like this resulted in an improved version of the original product. How many of us are running RHL? Skype is now close to Microsoft spyware that's impossible to remove from a Windows installation. Facebook purchasing Whatsapp, another service that formerly stressed encryption, resulted in things like plaintext backups of your texts on Facebook servers being aggressively promoted as soon as you loaded the app.
It's pretty much always cheaper to gut the original product, ignore the problems with your software, and enjoy the enhanced price of your shares while effectively spending no more money than you had for the original acquisition. As far as I can tell, Keybase has never had a business model or constant source of revenue.