In one of the past live streams, they said they listen to the players and worked with the likes and dislikes of celebrities from Sims 3. I don't know if you played Sims 3 Late Night, but that was where celebrities were added to The Sims 3 game. The problem with the celebrities as it was too easy for every single sim in town to become a celebrity, and it was a real pain in the backside. There was even a setting in the NRaas mod, it is very much like the MCCC mod for Sims 4, but for Sims 3. It had settings to bring this into a player's control. They listened and this is why they dialed back the ease of becoming a celebrity in Sims 4. The Sims 3 celebrities was a total nightmare, and they were paying attention.
If you are interested there are cheats for Get Famous, and also the MCCC mod will adjust the celebrity level as well. I used it to give a few of the premades celebrity status as well, like the Goths for one.
Here is a link that goes into more detail on the Get Famous cheats.
https://www.reddit.com/r/sims4Cheats/wiki/famouscheats