That the author wasted their time is purely your opinion, and really adds nothing to the conversation here. Why insult someone for doing something you don’t find interesting?
Is it a jealousy at not finding such a passion, or for being unable to dedicate sufficient time to make something of a similar scale? Is it that they see such passion as wasted because the subject in question doesn’t match their own interest? Do they not believe it is deserving of the eyes that are on it now?
You can speculate, but at the end of the day, making something, and showing it to the world like this, is an extreme vulnerability. The act of making something is often as valuable as the result itself.