I think I already know the answer, but I figure it's doesn't hurt to ask and see if there is any sort of protocol in place.
I am the moderator on the leaderboard for Empathy: Path of Whispers. The game's name is very often shortened to Empathy, to the point where that's what it's still referred to on Twitch. (That comes in large part due to the subtitle being added very close to launch, and the GiantBomb database not being updated until I asked them to myself.) I would want to use speedrun.com/Empathy for the game, but that is currently taken by a user by that name. The account appears, to me at least, to be inactive/abandoned. The info page says they were last online 3 years ago (close to the age of the account) with 0 posts or runs.
I know that currently, with my game having no runners other than me, there's not going to be any sort of special case for me, so I'm wondering if there is a protocol for this kind of thing. Is there an "abandoned account" system? This isn't a huge issue for me, as I did recently change the permalink to one I am relatively happy with (as apposed to the old one, which was the game's full name), and if it were, I could always message the user on their linked accounts to see if they'd willingly change their permalink. I'm just curious if there's rules or systems already in place about this.
Games and users on the site are completely different entities. Therefore, the identity of those entities (user name, or game name) are unrelated, and you can have a user and a game with the same name.
Note that the link to a game page and a user page are also different, as a user page link contains the word "user".
Game/series names overrule usernames. For example, there's a user named @batman, but going to https://www.speedrun.com/batman takes you to the Batman series. There's no conflict because you can still go to /user/batman to get to the user's profile.