> If it didn't work, people wouldn't still be doing it.

The same can be said for all sorts of activities, from the illegal and unethical to the mundane.

Although, to be fair, you're right. Which is why I actively make it my goal to make doing cold sales outreach more costly to the companies doing it than if they had done nothing at all. A BDR cold emailing me is a pretty good way to make sure your software does not get considered by my organization, and I'm very likely going to cost their privacy/compliance team more time than they spent contacting me unwantedly in the first place.