Bulls do this because they improve their 3 point shooting with Knecth, who is still on his rookie deal. They give up a highly protected FRP from the Blazers.
Blazers only do this if Maluach, Queen, or Newell falls to them at #10 of the draft, essentailly replacing Clingan as the C prospect. They pick up additional draft assets by doing this trade, including their own 2026 FRP from the Bulls.
Lakers do this to address the need for a Center and get a 3D guard.