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Well, that happens too, but there are far fewer people who initially start with powerlifting. Usually, young people come to the gym and just work out, and later some of those who stay start building strength cycles, creating new workouts, changing their technique, and so on. And they become powerlifters. Others continue to work out using bodybuilding cycles. In my opinion, this happens more often.
P.S. I'm talking about ordinary amateurs, not professionals. Professional bodybuilders naturally don't switch to powerlifting. Switching from powerlifting to bodybuilding happens, with Schwarzenegger and Colombo as examples.