Sound more like malware to me.
Installing a new version of Photoshop CC Adobe's installer will by default uninstall older versions of Photoshop you should use the advance install option and not let it do that.
If some setting may effect you performance I could see Adobe giving you an option to reset your photoshop preferences. I can not think of any reason that Adobe could have that creative cloud would remove photoshop from your system.
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There is a reset preferences option when starting Photoshop that will ask if you want to delete your preferences and if you reply yes. Photoshop will delete your settings and generate a new set of Adobe default preferences for your user ID. It does not uninstall Photoshop.
I don't even have photoshop open when it brings this up. I'm usually playing a game, or browsing the web when the creative cloud window itself pops up, asks me a question, and then says it's uninstalling Photoshop. Afterward, in order to use the program again, I have to install it.
I have captured a video of creative cloud doing the thing.
For the reference, this is my Windows 10 64 bit computer.
It does this randomly. Just pops up, asks me that question, and uninstalls Photoshop. It did this again after I ended the video, except it was already uninstalled, so it did nothing but sit at 100% for a moment.