I'm in the top 250 on Stackoverflow and didn't get any job offers through there. I wasn't looking but I think I've only had one person contact me off the platform which involved finding my website and then my contact form. But they just wanted more answers.
it wasn't through there, it made a difference in the recruitment and hiring process and I had my stackoverflow badge on my resume at the time
just happenstance that somoene at that particular company was looking for it. actually was a red flag that they were, but it paid a lot more than I had ever been paid before, for those 3 months I worked there