yankees.com redirects to mlb.com/yankees and this has been the case for decades. All of the clubs have their sites managed by the League. All of the owners went in on MLBAM (MLB Advanced Media) in the 2000s to centralize the tech league wide. MLBAM became BAMTech which then sold to Disney to became Disney+. The league still has a whole tech team to maintaining not only the majors but minor league teams too.