Good evidence should be corroborated whether that's from individuals (notoriously unreliable) or from autonomous systems. If those systems are under control of parties with different motives and they still agree all the better ultimately. Set up the system to corroborate bias to discourage manipulation... data collection systems set up by individuals are prone to bias according to the individuals setting them up.

Hence
Double blind testing.

Still argue that data is a better evidential starting point than no data.