I am not sure about BlackRock on this particular issue. I know most of the voting that happens for companies is because people with a 401k delegate voting power to the people managing their money. I would assume most of BlackRock's voting power in the board room is because they are managing other people's funds but I have not looked too much into it.
RE: Ubisoft shares continue to collapse after announcements of cuts and closures: from a total value of $11 billion in 2018 to just $600 million today