Hey, and thank you for your help! :-D
I've removed the tags you mentioned, and also added the new WH40K Inquisitor tag to all my WH40K Inquisitor videos - thank you very much for fixing the tag for that game! :-)
However, I hope you can give me some clarification here. I have used crossover tags before in some of my videos.
For Factorio, I also had the tag "production line". Factorio is a game that clearly involves using large amounts of production lines in your factory - but I also see that there is a game with the name "Production Line", that has the Youtube tag "production line" here. I removed the tag on some of the Factorio videos, and from my upload defaults for Factorio upon this realisation, but question follows further down.
For WH40K Inquisitor, I had the tag "tactical", which happens to also be a game (Even one I had never heard about, but since I noticed the tag, I clicked it and was sent to the game page here on Keymailer).
As for Tropico 6 - "city builder" is what I would classify as a genre of games. I would use that term to search Youtube and/or Google for city builder games (and I most likely would not add games, although that is exactly what I did to the tag - I changed it into "city builder game").
The Universim - "god simulator" also is what I would classify as a genre of games. The same I wrote above about "city builder" applies (and the same solution is what I applied, adding game to my tag).
Is the official Keymailer policy that it is my responsibility as a content creator to crosscheck these tags, by paying attention to my Coverage Stream, and removing/replacing any "offending" tag so that any video I publish on Youtube only gets hit with one tag, which should be the relevant one?
Please note that I am not making these arguments to be quarrelsome - this is genuine curiousity and a desire for clarification for the future, so I know how I need to tag my videos to fulfill the terms of Keymailer, which is an important site for a content creator to get proper accreditation on. :-)
Thank you again for your time :-)