You would think they would know I bought the tool. While putting in ads like this may be mainstream for Windows folks, I find this highly annoying on the Mac and quite frankly I think this behaviour needs to be avoided at all costs and I'm not sure this complies with some of Apple's guidelines. I'm surprised Corel has done this (well maybe not), but I'm surprised that it keeps appearing.
So, I think I've figured out how to make this stop.
What's causing this is an App called CUD.app, it's located in your preferences.
~/Users/<user>/Library/Preferences/com.corel.CUH.update/2.484/com.corel.CUH/CUH.app Since Corel wants to be jerks about this stuff, I'm going to take the brute force method and simply deny access to things via gatekeeper.
In terminal do this:
sudo spctl --add --label "DeniedApps" /Users/<username goes here>/Library/Preferences/com.corel.CUH.update/2.484/com.corel.CUH/CUH.app
sudo spctl --disable --label "DeniedApps"
You don't have to label it, you can just deny access, but by labeling it, you can always reenable it if needed.
Corel, if you're listening... Stop this bad behavior!
I applaud you for (1) figuring this out and (2) sharing it.
Windows users of CorelDRAW have sometimes shared analogous information for disabling some of these annoying things on Windows systems.