Why do random people's recipes have any credibility? Versus, say, Cook's Illustrated or Serious Eats.
‘Credibility’ in what sense? (IE. ‘credible witness’?). I would guess random people’s recipes are useful as big data if the data set is diverse with a long history. Unfortunately I can’t find a statement about the dataset to qualify this point
In the sense that I would want to invest time and money in making the recipe they are suggesting based on their recommendation.