Here's a reason each team would do this

Blazers: In some games, Nurkic is too slow to keep up with other centers, and playing Eubanks lots of minutes won't win them games so something should have to change there and this would be it.

Magic: Get 2 second-round picks, PJ, and Keon Johnson for Mo and Houston, and right now for them, getting any value for Mo Bamba would help him and the team they would have to pay PJ, and its worth the risk trading for him for sure.

Hornets: This is good for them because they get younger trading for Mo and get value for Plumlee's expiring contract.