Four Ways a Product Owner can Ruin a Scrum Team
1. Lack of Focus or Vision
2. Poor Communication Around Objectives and Results
3. Lacks Ability or Authority to Define Work Items in the Backlog
4. Lack of Respect for the Team

https://medium.com/serious-scrum/4-ways-a-product-owner-can-destroy-a-scrum-team-e6e5cff59eac