Anne Rice, Anita Blake, Women of the Otherworld, True Blood, Blood Ties, Vampire Diaries, Twilight, A Discovery of Witches, Night Watch, Lost Girl, and countless others.
You've just proved my point. None of those have brand recognition and Anne Rice is just gay romance and BDMS that happens to involve vampires.
Brand recognition is overrated anyway. Unless it's a huge brand like a movie franchise or something (although those are getting less and less valuable as studios ruin them), it's not going to be big enough to make much of a difference in profit unless you're making a cheap shovelware game in an uber niche genre where a couple thousand purchases by the tiny dedicated fandom of an obscure IP are considered amazing success beyond your wildest dreams. If you're making a free to play in an oversaturated genre, then brand recognition is completely irrelevant because you're guaranteed to turn huge profits unless your game is so sucky that it drives players away. Elden Ring and Apex Legends are completely original and they're huge. I'd think advertising would be a more important thing to focus on.
Also, the IP may restrict your game more than it helps. When Troika made BL they weren't fans of the IP and wanted to do their own stuff (Activision forced them to use the license), but due to contract stipulations they had to contact WW whenever they wanted to make changes and that proved to be extremely laborious and may have negatively affected development.
In any case, that doesn't explain the dearth of
indie games.