Anonymity goes directly against Twitter's advertising revenue model that requires targeted advertising. Platforms want to know who you are so they can collate data from disparate sources and appease their partners.

Twitter could verify that you're a human in order to let you use the platform, but they don't, they instead verify your identity. Google does the same thing, and Facebook, too. They want a phone number tied to real accounts with cell providers or photo IDs.

It's not just about bot prevention, it's about monetizing their user base.