I am not an expert, but pretty much I have the same idea as the others here(they have said it all) the animation is not smooth. it is to linear for the “standars”. probably your intentions were to have a linear movement, but lets be honest, the majority of items here (I dont know all of them) have smooth animation. try again from the star. you will get a huge different end result.
I can judge based on youtube. but it seems fine!
I get the same question when I get a hard rejected item. Your MG seem nice to me. NO CLUE!!!
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of course videohive has projects that might look very similar, but please check the date of them. you´ll see ther are from years back. it means that the new projects have set up a new standard of high quality and this is going to continue for ever.
I wont bother about security. Envato is a serious company and wont use your project and call it as theirs. On the other hand, I will definitely advice you to take that animation and put it in you rejected folder inside you computer. create a new AE file and star from Zero. it seems that you have talent of creating fire. you just need some fresh invention. make it again from scratch, and for sure you will come up with something that will be approved. i know how you feel. I´ve been there.
hope this helps.