Maybe they work with Androids or enjoy coding for Androids or don't know how to do it on the web or any one of a myriad of reasons? This isn't a very relevant

Maybe they work with Androids or enjoy coding for Androids or don't know how to do it on the web or any one of a myriad of reasons? This isn't a very relevant or constructive comment. It's just saying "why didn't you build something completely different," which, I think, is sort of condescending/non-productive.