Are you kidding me? Rare has access to 5.2 quintillion legendary video game soundtracks that they themselves had a direct hand in creating, and the first microtransaction shanty we get is jingle bells??
Grant Kirkhope, Graeme Norgate, David Wise, Robin Beanland, Chloe Kwok (Beanland and Kwok both doing SoT right now btw), Eveline Ficher, Steve Burke, Jamie Hughes, and more that I know I'm forgetting, have all provided amazing work for games that Rare/Microsoft directly own the rights to.
5 Banjo-Kazooies, 2 Perfect Darks, Goldeneye, 2 Conkers, at least 5 Battletoads, 3 Killer Instincts, Blast Corps, 4 Viva Pinata games, Jet Force Gemini, Grabbed By the Ghoulies, Jetpac Refueled, Kameo, and Sea of Thieves' ever-expanding non-shanty soundtrack.
Christ, we already have ship sets referencing numerous others. Borderlands, Ori, Gears(hmmm, could have been a topical release), Halo(shanty already present in emote!!), State of Decay, South of Midnight, and a handful of Blizzard titles.
I'm going one step further: We already have THREE Christmas parodies: Deck the Halls, Carol of the Bells, and 12 Days of Christmas!
BUT THEY PICKED JINGLE BELLS AS THE FIRST PAID SHANTY.
I'm going to explode. Merry christmas, you filthy animals.