It's not the same at all.
If they were really the same, why was there so much uproar over how annoying Shorts was when it was originally added?
How can you honestly think YouTube in 2016 was practically the same as Tik Tok? Why would these other social media companies spend so much trying to change to copy their same strategy if they were all already the same?
Short form content is radically different today than what it was in 2016. It's produced differently. It's presented differently. It's consumed differently. The audience is different. It's pervasiveness in society is different.