Many third party developers contributing to the open data movement wish to be acknowledged by the government for making productive use of the information. But many governments are at various stages of understanding the legal implications of acknowledging developers and their products, not to be seen as endorsing them in the process of raising awareness.
The government of Canada addresses this conundrum in the best way with it’s comprehensive Disclaimer found at its website (http://open.canada.ca/en/apps):
The applications created by the public have been developed, and are operated and owned by third parties. The Government of Canada does not endorse, approve, or certify the applications or the developers, nor does it make any representation or warranty that the information based on which the applications have been developed, including information licensed under the Open Government Licence, is accurate, complete, or correct. Your use of the applications and the information contained therein, including information licensed under the Open Government Licence, is at your sole risk.