I assume, though, that Google will eventually make some change that Microsoft doesn't want, and they'll be forced to fork chromium.
The recent proposals from Google[2] that hobble ad blockers and extensions like tampermonkey might even be enough.
[1] https://www.theverge.com/2018/12/4/18125238/microsoft-chrome...
[2] https://www.bleepingcomputer.com/news/security/chrome-extens...