In comments at the link below, some users say that their CCleaner was removed, and some say it was not removed.
http://www.ghacks.net/2015/11/24/beware-latest-windows-10-update-may-remove-programs-automatically/
Yeah, mine definitely was not, and it was installed previously on Windows 7 and then carried over to my Windows 10 install.
Personally, I have enjoyed 10 a lot.