Thread:
The content and links have been removed. However, I managed to get the links from a cached web-text version of that page on Google:
http://webcache.googleusercontent.com/search?q=cache:-ajScYCXVaIJ:https://www.reddit.com/r/2007scape/comments/87hmhb/selling_07_accs_for_steam_cashcsgo_skins/&num=1&hl=en&gl=uk&strip=1&vwsrc=0
The links are as follows:
https://imgur.com/a/3Ihs3
https://imgur.com/a/NuQPL
Despite there not being any usernames on display, Mod Weath was still able to ban these accounts. We can infer the following:
Accounts can be found by bank items.
Accounts can be found by by quest statuses.
Accounts can be found by by skill levels.
To be honest, I'm not at all surprised. They have the data, after all. However, this should serve as a cautionary tale for when you decide to advertise your accounts. Make sure to omit more stuff from your screenshots, namely more skills, incomplete/not started/irrelevant quests, collapse your bank contents and put the things you want to display in one tab and screenshot that (and omit amounts), etc.
gl
:edit:
After reading the thread that sparked my interest:
I came across this:
I will chose to believe this is truthful damage control. They perhaps found the accounts using the quests/items/levels, then investigated them further to see whether those accounts were linked to the same owner. I don't know if Jagex can get IP addresses of Reddit users, but I don't use Reddit, so I don't know what more Mod Wreath could have pulled from the original post.