The trope is about works that have a Captain Ersatz
of a story, rather than a character. However, a lot of the examples are just "one very broad element shows up in one thing, as well as another!"
There are just a lot of examples that seem like blatant overuse. There are serious reaches, like games that are considers S Ls
for sharing a single element. It gets particularly bad when it comes to video games. I know it's YMMV, but things like Sleeping Dogs
(GTA clone set in Hong Kong) being a SL for River City Ransom
(beat 'em up with RPG elements set in a high school) merely because there's a "focus on close combat"?
Additionally, there's an issue of games set in the same genre but with different settings that get shoehorned in as well. Okami and Beyond Good & Evil
get called this for Zelda, despite the fact that based on the description they're actually the exact opposite of this trope, since they have the same gameplay but different stories.
It needs some sort of clear description or criteria. Even for a YMMV it's very ill-defined.