Sign in Plymouth Meeting criticizes PayPal

A reader sent in this photo from Chemical Road in Plymouth Meeting where PayPal has an office within the Metroplex. We found the name of the organization that put up the sign, Workers Who Earn a Fair Wage, interesting. If they earn a fair wage, why are they upset?

Or is it workers who earn a fair wage supporting workers who don’t? We googled the name and couldn’t find any mention of it. So it remains a mystery.