This paper explores the public value outcomes generated by collaborative platforms in public services through a comparative case study of 25 privately-owned digital platforms across various public service areas in Italy. The study confirms that collaborative digitally-enabled endeavors can have both positive and negative effects on public value, highlighting the challenges associated with multi-actor dynamics and the delicate balance between public interest and private gain in public services. The findings reveal implications related to user-centric platforms, including concerns about inclusivity, autonomy, decision-making abilities, and privacy infringement. Additionally, the study suggests that collaborative platforms alone do not enhance collaboration in public services unless accompanied by strong public governance that promotes interoperability through standardized frameworks, common templates, and data reuse.