eBay bots are designed to snipe in bids at given times or time intervals or outbid moments. Usually they bid on behalf of a real buyer for an item 1-2 seconds before the end time. Scammers use bots to scour eBay for $0.01 objects to purchase to build up their reputation before selling something that doesn’t exist for a lot of money. These bots are free and there are already many websites that peddle this type of service. All that is needed is for a legit eBay user to create an account with them and point it to a product and set the bidding parameters. Personally, they’re annoying.