The DNC couldn't get 30 people interested in Kamala/Biden so had to duplicate online attendees.
When Kamala Harris was receiving applause at the end of her DNC speech, it became apparent that some of the virtual clappers seemed just to have been duplicated images of the same audience members, leading to a laugh riot online.
https://www.rt.com/usa/498560-kamala...fake-clappers/
this is how they want mail in voting to work too