if you consider GPT-based agents and their principals lifeforms, then the niche that makes the most sense is probably parasitism: mimic streams of data that are valuable well enough that it would take more resources to detect the mimicry than to acquiesce to it
i'll leave the reader to make any conclusions from biological parallels themselves
the future of social media is infinitely many ChatGPT instances arguing increasingly fine points of whether "bi lesbians" exist, forever