I can see why even a black box implementation of the program would help learning in some instances. However, beyond checking your solution against the 'correct' solution I don't see much value.

Pertaining to Algorithmia - many pages list little to no information (i'm ignoring the weka/opencv/already open source implementations just put into the site for shits sake) as to what is being done to compute the output. If I'm looking to learn, this is not the tool i would use.