The Dodgers acquired Shohei Ohtani during the off-season on a record-breaking $700 million contract--he's a once-in-a-generation two-way player (meaning he can both pitch and hit at a high level), and consequently one of the most famous and beloved people in Japan. On top of that, they also have Yoshinobu Yamamoto, a pitcher who was dominant in the NPB (Japanese pro league). Oh, and it's important to note that baseball is the most popular sport in Japan. So the Dodgers are a natural choice for a Japanese company of any sort to collaborate with, VTuber or otherwise. I wouldn't be surprised if they had a dedicated team for handling Japanese sponsorships.