I think many times the autodialer does a bit of a pre-screening. Like, if I say “hello?” there’s a quick pause and then either the recorded spiel starts (which is more pre-screening) or I get connected to a call center (there’s usually a little “pop” sound).
It’s like any other business… they want to be talking to qualified leads because they only have so many call center scammers. This is why Kit Boga et. al. are truly doing the lord’s work by wasting that precious time.