I think this is great PR... he is getting other people engaged and interested ... but at the same time, if you were a competitor or were coming up with something very close to his product, then you could get ideas (but I would say if you are ahead of him or have already launched something you have great advantage otherwise it wont make too much difference)

it might even be to his advantage, by discouraging those that are just starting to do something similar by showing how much ahead he is!!