I think it's disappointing [1] for a group of people (however smart they are, whatever titles and fame they have) to think they are the gatekeepers of mathematics, the core of human knowledge. In this respect "mathematics is what mathematicians do" is no longer true, perhaps it was never a useful thing to say. Mathematics is (downstream) consumed in some shape or form by every human on Earth, and no elite, appointed group gets to decide how new mathematics is created. I feel this is a reaction to the sting of the reality check for these people, who are gifted with amazing genetics, and can think faster and deeper than other humans, that their gifts are relative to humans, and machines can still outdo them.. but this is already true for so many other areas, from physical strength to playing chess. Also, I feel this reaction is just non-sensical, it reminds me of when commercial software company CEOs [2] said open source is communism in the early 2000s, because they felt open source is threating their business model.

Lastly, deep down I don't really get what mathematicians are so upset about. All open problems, once solved, are not solved by 99.9999% of mathematicians, because it's solved by one or a handful of others, and the others just learn of the solution/proof. Mathematicians can now still organize conferences about these proofs, discuss them, digest them, think of new avenues of research, etc. They don't even have to invite OpenAI, in 6 months whatever model is available on chatgpt.com will be this smart anyway, and they can use it in the workshops for explanations, etc.

[1] I was going to write "I'm a bit disappointed by the response of the math community..", but then I remembered, whatever T. Tao writes is not the position of the math community, it's his position. Then I was going to write "I'm a bit disappointed by the response of T. Tao..", but then I remembered, I don't know Tao personally, so why am I disappointed?

[2] Steve Ballmer of Microsoft, I believe