In the same way that you cannot compete against Ford at making cars without capital because Ford used their capital to automate manual labor at prices and speeds you'll never be able to reach.

"Intellectual" jobs, that require thought were yet spared, as the only way to use capital for that was just to pay for more meat: see Accenture, CapGemini, IBM, etc. You could carve yourself a spot for some people because it was hard for this capital to reach them. Now that AI, a literal machine that automates thought, is here, the costs for reaching bumfuck nowhere to take the clients away from you has dropped drastically for them, but not for you. They get economies of scale, already established patterns, tools, internal databases. You're starting with hopes, dreams and a $20 Claude sub that runs out at 10AM.

There is not infinite need for lawyers, there being more lawyers does not create more legal opportunities and cases past a certain point, and you're then dependent on other things like there being enough judges.

Robots transformed capital into manual actions and killed most manufacturing jobs save for precious few experts or things that are too expensive to automate still. AI will transform that capital into intellectual labor and crush you, take all opportunities away from you.