The thing is that, acting in a role within a movie (as in Hollywood tier) differs from making a short on TikTok or being a YouTuber. As in you can have the title of "actor" or "actress" but lack long term experience within the industry (Tom Cruise has been actor for 45 years making his debut in 1981 while Millie Bobby Brown has only started acting since 2013, she became famous in Stranger Things).

Most famous actors today started as extras or in minor roles first before making it huge in cinema, kind of like how Brad Pitt is an extra in No Mans Land (where Charlie Sheen was the lead actor) where he's a waiter or how Bruce Willis was in The First Deadly Sin (Frank Sinatra has the starring role) as an uncredited extra ("man walking in diner") where he's not famous yet until Die Hard.

Meryl Streep would obviously have a longer acting resume than Jenna Ortega (the biggest contrast is that Streep was born in 1949 making her a Boomer while Ortega was born in 2002 deeming her Gen Z) since establishing a long term acting career takes ages (on achieving stardom), like Streep has been an actress for 50 years while Ortega only has 14 years of experience within her acting career.

Now, I've heard that Hollywood at least: is considering the metric on hiring (TikTok) influencers as potential movie stars, the thing is that being an actual movie star requires talent, dedication and grinding from "nobody" (extra) into being famous when the opportunity arises while those from TikTok don't possess "acting" talent.