Most of those X accounts (twitter) are filled with bots and some inactive members. I don't know if Elon succeeded in ending the bot era, but earlier there were some active bot apps and sites where you just need to pay a few dollars and they will give you any number of followers you need.
 
Currently, there are also some influencers that offer social media account boasting offers. They ask their followers to follow the account or run some free giveaways for those who ever follow a particular account. There are a lot more ways to get fake followers nowadays, but you can easily identify an account with fake followers by checking their tweet history. Judging by the number of engagements their posts attract, you can differentiate real followers from bot accounts.