I never pulled numbers but since I got most of my first 100 users through this without paying any money, the ROI is positive :) Time was an investment though, and that's why I hope my service will help here.
I was not involved in the original comment and not planning to publicly talk about my service until it's live, but the opportunity was too perfect to miss.
I’ve had success twice using targeted social media outreach — specifically by joining relevant subreddit discussions and commenting on YouTube videos where my target audience was already active.
Instead of simply promoting your service right away (it often feels spammy), I recommend genuinely engaging in conversations until the right opportunity comes up.