I pay for and use Robokiller and it sucks, about 30% of spam calls are blocked. I used GV for a long time, but abandoned it once I learned Google was silently

I pay for and use Robokiller and it sucks, about 30% of spam calls are blocked. I used GV for a long time, but abandoned it once I learned Google was silently dropping group chat messages (without telling the sender) because they let their gizmo5 purchase languish with no dev work for years and never implemented MMS (this was a couple of years ago). Google had such a head start with GV, but did nothing with it and let iMessage catch up and pass them. If there's something that I find completely puzzling about Google it's their disaster around messaging strategy. It's also frustrating to me that all of these mediocre blacklisting applications (robokiller, hiya, nomorobo) only exist as hacks because neither iOS or Android allowed the obvious contact whitelist ability. Though it sounds like in iOS13 this may finally be changing.