But I wonder whether the effect of an unknown dataset slowly seeps into the algorithms as they are tweaked, especially when 100s of algorithms are competing to

But I wonder whether the effect of an unknown dataset slowly seeps into the algorithms as they are tweaked, especially when 100s of algorithms are competing to fit that data. It might be akin to the fact that if you correlate more than 25-30 sets of 25-30 random numbers, you would find at least one statistifcally significant correlation.