I couldn't find any server that is related to this giveway or fake exchange.They just made a bot to send messages to random people they find on Discord projects servers therefore I couldn't find anything concrete about the thread creator/author of this scam sorry.
I thought MEE6 was native to the server: it couldn't message just
anyone. It seems like that was a welcome message from one of the servers you joined.
Could be wrong, not too familiar with Discord.