"Stealing" a game name
A game's title, as far as the site is concerned, is just a string of characters.
If you cannot use exactly the string of characters that you want, I bet you could get pretty close. You may need to add some brackets for example, or a colon with a subtitle or something. As long as your selected title has some unique alphanumeric characters that the other, perhaps more desired, game title does not have ... you should be good.
Like so:
A Game
A Game: Cool Subtitle
A Game [5E]
A Game: Cool Subtitle [5E]
A Game [D&D 5E]
A Game: Cool Subtitle [D&D 5E]
[D&D 5E] A Game
[D&D 5E] A Game: Cool Subtitle
^^ Those are all different and could be used as distinct game titles.