The difference is likely that these companies had the type of presence that causes Chinese law to come into effect ... such as physical presence (servers), buil

The difference is likely that these companies had the type of presence that causes Chinese law to come into effect ... such as physical presence (servers), buildings (owned property), human presence (employees, especially if they're Chinese citizens), financial presence (bank accounts, insurance), business/legal presence (i.e. local corp, subsidiary, company of some sort).