They have to protect their trademarks or they risk losing them so they send out C&D letters so they can show they actively protect them. My old watering hole u

They have to protect their trademarks or they risk losing them so they send out C&D letters so they can show they actively protect them. My old watering hole used to get them from Archie Comics and ended up changing their name to avoid the (legal) usage of a trademarked name, mostly because they didn't want to spend the money to prove they were in the right.