There have been eight franchises in "Big Four" sports that have moved from one media market to another this century—the Expos to Washington, the Grizzlies to Memphis, the Hornets to New Orleans, the SuperSonics to Oklahoma City, the Rams to Los Angeles, the Chargers to Los Angeles, the Raiders to Las Vegas, and the Thrashers to Winnipeg.
In terms of sheer weirdness, none of those relocations can quite approach the Athletics' move to Las Vegas—a move formally approved by baseball's owners Thursday. The franchise, owner John Fisher and commissioner Rob Manfred spent much of the pre-move process in open antagonism toward fans of Oakland and baseball writ large.
Thus, when Fisher wrote an open letter to Athletics fans after the relocation's approval, it was received accordingly.