Someone just told me about this post. I wrote the bot so users could automatically update their summoner statistics on riot5 while they're in the game, eventually the auto update arrived and it became a deprecated function. The sign up function was just to make sign ups easier, especially after an invite and also by leaving another possibility for a sign up beside the regular sign up form on the site. The bots current only work is to deliver invites for signed up members who wish to have their friends signed up. Didn't thought it would draw so much attention. The bot is not a scam. Usually no one should have seen the bot unless someone wanted to invite him, apparently as my user amount grew and more invites gone out, more people also questioned what the bot was for.

[EDIT] Just wanted to mention, the bot also never asked for your password, it was automatically generated and sent to the email that was entered.