Look, people fall into all sorts of categories based on various individual characteristics. There is no one-size-fits-all solution. It sounds like maybe you don't like seeing ideas that aren't best for you?
Let me encourage you to just keep scrolling if someone's idea doesn't fit you personally.
It'd be one thing if you offered a complete solution, even if cumbersome. Lots of open source projects require more steps than, and have various limitations compared to, their commercial counterparts; heck, for many of us, those extra steps are a feature, not a bug.
But all you did was to mention Google Voice, not exactly an obscure VoIP product and which, again, does not provide a whitelist. A whitelist is fundamental to this product's raison d'être, and to its appeal to parents. If you can't understand that, I don't know what else to say.
Dude, like I said - if my idea isn't your cup of tea, why the outrage? It took me time and effort to type it out that I could have spent elsewhere, but I wanted to help (some of) my HN community -- ok not you but why be upset at me?
It's a different idea from TA with a different set of ideal users. But it's a better idea for some who don't need all the features and want to pay less. The idea may not be perfect but it was free (but not for me).
Let me encourage you to just keep scrolling if someone's idea doesn't fit you personally.