Mark Zuckerberg’s threat to shut down Instagram and Facebook in New Mexico  over the state’s demands for kids safety protections is a tactic he has previously used to dodge regulations – but as the lawsuits pile up, experts say the act is wearing thin. Meta’s warning came last month on the eve of a trial in which a state judge will rule whether to impose strict safety rules in New Mexico against the social media giant, which was slapped with $375 million in civil penalties for failing to protect underage users from sexual predators. Once an effective tool for gaining leverage and grabbing headlines, the shutdown threats are quickly becoming impractical for Meta, according to James Grimmelmann, a professor at Cornell Law School. “In the long run, the problem for Meta is that similar pressure will be coming from other states, both in lawsuits and from regulation,” Grimmelmann said.…