It's nothing but bots. Yes it's an old black hat trick that certain websites were using a bot on their server to attract visitors. The intention behind this is to drive traffic from website owners. Let's see how it works. A website using such black hat tricks to gain traffic will have a bot on their server. They will usually find and visit newly started or upcoming websites or blogs. This will mark as a visit from the website that using the bot in the analytics platform of the target website. Most often the owner of a newly created website or blog will be checking the analytics frequently. So there is a greater chance to find this visits from the website that using a bot as there will be only very few traffic. These bots are generally referred to as bad bots. There is nothing surprising if a new blogger or website owner visit the website that giving traffic to his/her website. He will check for a backlink too. That's the primary target of using a bad bot.