A company's pettiness can know no bounds, and a toy company is just as capable of hiring firms that specialize in de-anonymization as any other company is. The

A company's pettiness can know no bounds, and a toy company is just as capable of hiring firms that specialize in de-anonymization as any other company is. The company itself also has billions of dollars of revenue and can hire experts in the field themselves. Companies do not just log IP addresses and email addresses, there are billion dollar ad networks that have refined the game of tracking users across browsers and devices, and they certainly do not rely on just IP and email addresses. Many companies keep extensive logs of analytics data that their customers generate that amount to much more than IP and email addresses. If a company is motivated enough, there really isn't anything stopping them from cross referencing their own logs and employees/users' identifying data with whatever Glassdoor, and any of its partner services they've integrated with, collected from their users. And it isn't just JavaScript that leaks identifying information, most browsers do it by default. JavaScript just makes it stupidly convenient, more accurate and opens the door for novel methods for collecting identifying information.