The third party chosen by the user may be a competitor; however, the Regulation places limits on using the data to develop a competing product, and contractual protection can be structured.
You are not obliged to hand over everything unguarded. The EU Data Act lets you protect trade secrets — attaching proportionate safeguards, and in exceptional cases withholding specific data — and it bars the recipient from using the shared data to build a competing product. Build those protections into the sharing interface and terms rather than relying on goodwill.
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