I mean, there is a huge amount of investments that small and medium business all around the world do not do because they don't have enough scale to get a good ROI from them. And they most often lack that scale because there's a labor cost within that investment that doesn't vary with business size. If you reduced the non-elastic labor cost, you'd normally open up a market that grows exponentially with that cost reduction.
Now, there are all kinds of ways to go after this. In theory, that's the most obvious huge application of an AI, but there are simpler avenues for that, like standardizing things, mass-selling things that currently require personalization, creating high productivity tools, or just pushing some prices down and hoping for the best (what may be the greatest way to spend VC money).