The amount of times I see someone say that you don't own something you made if you post it to the internet(INCREDIBLY FALSE)makes me wanna scream so much.
Fair use laws are confusing sometimes but there's no where that says you lose copyright of something because you shared it.
THAT'S NOT HOW THIS WORKS
Please for the love of everyone's sanity look into your own countries fair use and copyright laws. Like jfc this is how we get people thinking its legal for Disney to steal someone's 3D rendering of a character or that fic authors/fan artists don't own their work.
Disclaimer: fanartists and fic writers own anything they make, they simply don't own the character(unless it's their original character)
And for the love of all that is good DO NOT ASK THE CHAT BOT IT WILL HALLUCINATE A LIE. Asking c.gpt for answers is like asking someone who's tripping if reality exists. It's just not a good idea.