When the United Kingdom began requiring thousands of websites to verify their users’ ages last month, one group saw an enormous burst of traffic: pornography sites ignoring the law.The sites that complied — by mandating that users show their government IDs or scan their faces through their webcams, so an algorithm could estimate whether they were adults — saw visits from British internet addresses collapse. But some of the biggest porn sites that disregarded the “scan your face” rule entirely ha...