This is for people who want to farm for engagement and then convert that engagement into monetary profits. This is where all social media and many online platforms are headed. Any platform where the goal is engagement will eventually end up saturated with AI avatars that are trying to trick people into buying stuff or clicking on links to sign up for stuff so that the original account can get some referral bonus on some blockchain.

You're thinking about this in terms of what value it's going to deliver to you personally but that's not the goal here. The goal is to keep people engaged, that's always Meta's #1 priority because the more people spend time on their platform the more revenue Meta can generate by showing people ads. So if "creators" opt into using AI avatars then that means the people who follow those creators will habituate themselves to interacting with the human/AI hybrid and if the behavior is addictive enough then that will increase engagement. Regular engagement farming accounts can only spend time on the platform interacting a certain amount of time (they eventually have to sleep) but these AI/human hybrid accounts can interact with everyone 24 hours a day, 7 days a week, across geographic boundaries, and in any language.