Search for "How Starbucks treats their workers" and see why large companies get attacked too. If you search for your favorite local coffee shop, you won't see such complaints.

But go to /r/starbucks and you'll sometimes hear that a lot of small shops are worse, for various reasons.

Large companies attract certain classes of criticism not by being worse, but by being more visible. Unfortunately, this actively masks some of the wrongs that they actually do.