Hello @PokSoh and welcome to our friendly community. Not everyone has access to all the different features/events in the various games. As a result some people have the opportunity to watch ads for extra lives or boosters and other people don't. I have never seen any ads (or had the opportunity to watch them) in any of the King games I play. I may have to wait to play again when I run out of lives - but I still have a lot of fun playing the game.
One suggestion is to join one of the Candy Crush Friend Facebook Groups you could ask for lives that way.