Popup - https://tf2unity.com/
Associated Steam Accounts
https://steamcommunity.com/id/zoltrade (Scammer)
https://steamcommunity.com/profiles/76561199131830626 (Fake trading bot)
Related Info - https://www.reddit.com/r/tf2/comments/ncpmdb/pain_be_aware_of_the_bot_and_site_listed_in_the/