Writing is like art, some are naturally gifted while some need work, practice, *constructive* criticism, a mentor, etc. Bad character development can be changed, plot holes can be fixed, there are online websites that tell you about what my teacher called the "climax rollercoaster", so your plot is ever-twisting and changing. You can very possibly develop a level of creativity from hard work.
But there's something really aggravating and *bland* about someone stealing another's direct ideas.
How you'll describe to them all these details and backstories and deep conflicts, and they have the audacity to take it and apply it to their story, and despite writing it in "their own way" because their writing style is different, having the exact theme, plot, characters, development, conflicts, and resolutions.
Taking small elements from a popular story is normal; cliches are even more common. Anybody can take those and add a twist- just one- to set them apart from the others. Or even writing your version of a popularized story- perhaps like another Cinderella with zombies.
But to steal a highly specific, detailed idea? They don't even hold the passion for WANTING to be creative. People like that are sometimes the most boring people you'll meet, or the most manipulative- suddenly you're the one who stole your own idea.
If they do find creativity, it would be to exaggerate the original experience in a matter of competition because to them, more = better (wrong). Instead of "she died on the way to the hospital", it's "she died THREE times on the way to the hospital". Its not "I killed someone in self defense", it's "I killed someone in self defense and four more people for fun".
By doing this, they ensure that they can be the first to accuse you of thievery, because their story "has more in it".
Do not steal highly secretive and important stuff from your friends. Find your own process to properly create without taking from your personal group. Or don't write.