So what's the actual issue here? That on HN and Reddit and Instagram and X there'll be a lot of bots? As if they haven't been overrun by human astroturfers/etc for ages. Even ignoring that, what's the biggest issue you see with that, and why is it so big that it's fine to just enable a monopoly?
Your presumption that there has to be an alternative is flawed. Maybe there is none. You're saying there's a real need, great. There's also a real need for sexual assault to be completely eliminated worldwide. I think everyone would agree with the that need is far bigger than bots on social networks. Doesn't mean we should just jail everyone just in case.
You're manufacturing a need here as so important that by definition the ends justify the means. They don't.