Agreeableness and openness to new experiences are 2 of the 'Big 5' personality traits. Some people are very likely to see everything as an opportunity, assume positive intent, and want to give someone a chance. If one thing doesn't work out, it was one thing, and the next thing is completely different. I imagine cold emails work very very well with these people. Lots of these people exist.
I'm not on the same side of the spectrum for either of those traits. I usually see these things as a waste of time I didn't ask for. My own experience with sales people makes me distrustful of their intentions. If one thing doesn't work out, I think all the next things that look like it won't work either. Cold emails don't work for me; case studies, hands-off demos, etc. where I am researching you, I have approached you, and I feel like I am controlling the engagement with you, work better.