This doesn't make sense. Companies like Google have plenty of shirts and hoodies with the companies names on it. Plenty of swag on campus too for new employees and university events.
Distributing them would imply it's a top-down company-sponsored/encouraged protest and not a grassroots event that the company permits.
Even still, having to wear company swag if done offsite was just an example of why it occurred on their campus. There are many other reasons to have had it on their campus rather than at LAX - including time away from office, the photos of having it at their campus, so on.
