Honestly been there lol. Last year I almost bought a GPU from some dude on a local classifieds site — same username showed up on a scam report thread when I dug deeper. Total bullet dodged. Manual searching is a nightmare though, you end up in 10 tabs going nowhere fast. What actually helped me was GEOfinder name lookup you just drop the username in and it pulls associated profiles across platforms automatically. Way less guesswork than Googling “username site:reddit.com” for 20 minutes. There’s also Sherlock if you’re comfortable with command line stuff, and Namechk for a quick free scan, but they tend to miss smaller forums. The geofinder one caught a Trustpilot review profile I never would’ve found manually, which had complaints about the exact seller I was checking. Ended up being the thing that made me walk away.
Basically: before you send any money, 5 minutes of username research can save you a whole headache. Sketchy vibes are usually sketchy for a reason.