Oh dear. Federation at its finest /s
If the instance is too small, it will easily fall over under heavy traffic. If it is too big, it is highly centralized and even then it cannot scale at a maximum of 300,000+ users at the same time.
Eventually, they would all be re-centralizing back to Cloudflare. Once that goes down, all of the biggest Mastodon instances go down at once.
As for GPT-4 in mathematics (LLMs in particular), in goes inline on what I said before. Fundamentally, these LLMs cannot reason transparently, nor can it directly bring up its own mathematical proofs with thorough explanations that allows mathematicians to work with. Only low hanging fruit of summarization of existing text.
If Mr. Tao can see its limitations, surely it puts the hype of unexplainable magical black-box LLMs to rest as being great sophists and bullshit generators.