This has always happened, way before AI. You'd spend months or years building and growing your business, and then Google would release a feature or product that would kill your business overnight because they can throw way more money at the problem, plus their branding. That's life.
But you're talking about business, where competition has always been expected. OP is talking about mathematical research, which has stood on hundreds of years of cultural tradition driven by human individuals sharing ideas, collaborating, building on each others' work, all for the benefit of humanity.
