SAN FRANCISCO — The war may be over for Uber Technologies Inc. But by cutting a check for tens of millions of dollars to settle a slew of threatening labor class actions, it may have just bought the gig economy a whole new set of legal battles.

Lawyers say the $84 million settlement that Uber reached—which can rise to as much as $100 million if the company goes public or is acquired and increases in value—is like a flashing neon invitation for the plaintiffs bar to keep waging the fight.