Those marks are notice of a claim. Known, willful infringement carries much higher penalties than accidental infringement. There's also a protect-or-lose standa

Those marks are notice of a claim. Known, willful infringement carries much higher penalties than accidental infringement. There's also a protect-or-lose standard in the US for trademarks that is unlike patents or copyrights. "Vigorous defense" IIRC is the term. Either the lawyers are having the copywriters maximize the notices to be very clear, or the copywriters are told they need to include the symbol and are being overzealous in how often they include it. IANAL.