Platforms should not give vetted external researchers a privacy-preserving API for studying ranking effects.
The re-identification and competitive-harm risks of any research API outweigh its measurement benefits.
Is there a better alternative than A to achieve G?
Is A feasible for the agent (ability, resources, time)?
Is the goal/value G explicit and acceptable?
Will doing A actually achieve G in the present context?
Is doing A permissible/appropriate given norms or constraints?
Do negative consequences of A outweigh achieving G?