Here are some of these concerns to keep in mind:
Communication challenges
Time zone difference
Inaccurate Understanding of Requirements
Scope Creep Due to Assumptions
Misaligned Expectations
Difficulty with Revisions and Feedback
Ensuring quality of work
Project scope creep and hidden costs
Reliability and Availability
Intellectual Property and Security
Skill Misrepresentation
Payment Disputes
Lack of Accountability
Long-term Support