Maybe. I don't think Atrium will ever become one of 2 or 3 big law firms. There will always be thousands of business law firms. Tech enabled service companies don't seem to have the same winner-take-all nature you might see in platform or network effects businesses.
Even without the winner take all potential, it still makes for a great $100M business idea that seems much less risky to me. There can be dozens or hundreds of $100M trucking companies. That's a lot of winners. :)