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You can create an obligation for yourself or make a binding statement of intent.

Indeed memoranda in the UK, created when registering a company, require it. You state the intended services. Companies weasel around it by making broad milquetoast claims.

A statement binding the organisation to release their data and cede all copyright should the site be terminated, for example, would demonstrate good faith and go a long way to reassuring people that it wasn't wasted effort.