Tell that to Craig Walker[1]:

* Founds telephony company Dialpad, sells to Yahoo. (I think it was the basis of Yahoo's search-via-phone-call service.)

* Founds telephony company Grand Central, sells to Google, is basis of Google Voice.

* Founds telephony company Dialpad (he bought back the name and domain).

[1] https://www.businessinsider.com/google-voice-founders-raised...