These are just the issues that you are getting with blocking things like this. Some websites might fall into multiple categories.
There would be however some way to investigate what domains actually contain gaming stuff compared to driver downloads in case of nVidia.
From just looking at it, this seems to be something advertising-related.
You will receive emails.
We are currently running a fundraising for proper DNS filtering, the IPS is not supposed to do this job. As I stated in my blog article, it is a backstop.
For the proper DNS firewall, there is a roadmap item here:
It is not on the mockup screenshot, but you will have the option to whitelist anything custom, as well as creating your own blocks, or only enable certain lists for certain zones or hosts.