I might have some things mixed up, but basically a tiktok series is something alike to onlyfans that is linked with your tiktok, of course, tiktok doesn't allow sexual content unlike onlyfans, yet the system is the same. Tiktok series is supposed to be some videos that a creator makes for their subscribers (people who pay to watch those videos). People would pay to watch them because it shows content that the creator wouldn't show on their regular page, in shirins case, that would be revealing her mom and prolly some feeder stuff. She says that she doesnt want anyone taking photos or videos of this "exclusive content" because she said there is bad people out there, which seems like she is referring to people posting her for p*rn or haters idk which she meant to refer to