Those jobs are much more niche, and require much more specialized knowledge. Google alone probably has more software employees than all of the high paying trading firms combined. It's a possible career path, sure, but its like comparing taxi driver opportunities with stretch limo driver opportunities IMO. Totally different scales.

AI is much more similar to classic cloud/infra with a lot more OSS than finance afaik, and probably already employs more devs than prop firms.

(I'm not counting big bank jobs because those are definitely not high paying)