I’d prefer a dictionary, but ultimately the AI will just use that anyway…
By your definition, is every fan a player or are there fans that are not players? Is every player a fan? Is someone who never played the TTRPG but enjoyed BG3 a fan?
There are fans that are not players of D&D. There are those that bought the rulebooks (4e would be a great example of this) that are definately NOT fans of D&D. Many of the fans (which were more numerous previously) would be those who were avid fans of books series such as Dragonlance or the Forgotten Realms, but never played the game itself.
Current fans would be those who were either actively engaged in the D&D community in some way (digitally, social media, convention goers) or supporting it in some fashion (even if they don't playing, they are buying books, rules, etc).
Fans in general will equal some sort of ability to profit off of them (Fans = Money) IMO. Not all of them, but with an active product like D&D, most who are actual fans will be willing to spend money on something, or if they go for something free, be able to help generate money (for example, even free accounts on beyond normally end up with at least one person who is going to spend money who is connected to that group).
We aren't talking about the guy who played D&D back in the 80s and hasn't thought about it in 40 years, tossed his books, and has no connection to it anymore, we are talking about those who are excited and enthusiastic when they see something with D&D...you know,,,fans.