The scientific term is Variable Rate Operant Conditioning. It's where you press a button, have some chance of a reward (winning money or seeing a video you like) and can immediately play again. It's the same mechanism.
From rats on up to humans this is known to be an extremely addictive behavioral pattern. Social media like Tik Tok can perfectly balance how much reward to give you to keep you engaged while filing the non-reward results with ads and other messaging they want you thinking about.