Someone knows how to do this effect?? / Solving every unorginal/low quality content problem

So I keep seeing videos on tiktok with this little effect in the back and like an orizontal line - in the middle or something like that.

I understood that this is so that tiktok Ai cant target your videos as stolen/unoriginal content EVER, Even if you straight dowload a video and reupload it with this effect on the bg It will count as 100% original and will be pushed on the FYP. Would really love is someone could tell me if there is a website or how to do it.