@XxMiss_SummerxX Inkitt has an option to where you can post the story on the site or just the app or both. I've posted mine (ones that aren't on here) on the app only. It's a bit harder to steal that way. Also, as long as you mark it incomplete, I've found it's less likely they'll steal it because it takes forever for an update, those reading apps have deadlines, and you only have a certain amount of time to get chapters up.
Also, you could fully publish your work yourself. You could look into it. And it wouldn't cost much for people to read it. Amazon Kindle Unlimited is $9.99 a month for all you can read, and there are a lot of books to choose from. Also, if you're more into the pay-by-chapter (not my favorite), you have Amazon Vella.
Not sure if this info helps but it helps keep your work safe and unstealable. Well, not on Inkitt unless you put it on their pay-by-chapter app. It's just harder to steal when it's only on the app instead of the site.