Well, for one, you get a completely crossplatform method of executing and deploying what would typically be especially painful to distribute to a wide user base

Well, for one, you get a completely crossplatform method of executing and deploying what would typically be especially painful to distribute to a wide user base spread across various hardware families. Think of everything you can do with openCL then take the subset of that which is applicable to games, or spreadsheets, or novelty,- a non-trivial amount- and make that portable via browsers to create a much better experience for you and target users. Worst case is it provides an easier to use way to learn opencl for beginners in that area. If I remember correctly, and I may be terribly incorrect, the MIT jersey kids were going to have you mine bitcoins instead of look at ads; I think it got shot down due to ability to abuse it rather than inherent badness.