Well the situation does seem quite bad when you see people who leave fake reviews become brazen enough to actually advertise their services on Amazon itself [1]. I reported this review about 10 days ago and it's still up. The email address provided appears on hundreds of product listings [2]. When they can't even filter out nonsense like this I can only assume they put zero effort into tackling fake reviews.
419 eater is a site dedicated to exactly that. The general idea is to act totally clueless about everything. They want a scan of your passport? Request instructions on how to use a scanner and do everything wrong. Some people take this a lot further and get scammers on "safari" - a long and expensive trip where the scammer believes they'll be meeting their victim but instead just waste their time and money.
I managed to register a Yahoo account when I was a child with the password of 'poo'. Login still works although unsurprisingly I do get a notification of suspicious activity on the account.