Well it wouldn't be free software, because the requirement to publish source code publicly is at odds with the free software definition; the freedom to do something is not an obligation to do it. Copyleft simply means that if you choose to distribute the software, that you must do so under the terms you received it.
https://www.gnu.org/licenses/license-list.html#Watcom
But, suppose the free software definition was written with this requirement in mind - as other commenters said it would be untenable, and potentially hazardous if you are using the software in a hostile environment.
The challenge is that we're not just selling software, we're selling an idea - the idea that users deserve control over their computing. We're not competing on the proprietary software marketplace, we're offering an alternative to it.
We are already seeing the proprietary software world enshittify. More and more "non-tech" people are looking for a way out. The challenge is to demonstrate that these problems are inherent to the world of proprietary software and not just because "Google is evil."