Because as soon as you have a kid, your entire life is 1) work 2) family 3) sleep, 4) MAYBE some self-care, and there's not a lot of room at all left over for making friends, finding work opps that are better-suited for you (or higher-paying, or both), or finding sexual/romantic fulfillment if you're single or just completely checked-out of the relationship with your coparent (although it seems there's an unspoken but known thing that parents of toddlers are at the bottom of the well in terms of personal and relationship happiness level, and that it might improve with time?)
I'm sorry you (or the hypothetical subject of this post) is going through that. I don't think LLM-based social media is the answer to increased atomization and isolation when there's money to be made from atomization and isolation.