Betting bots aren't necessarily illegal, but they are frowned upon, both by iGaming companies and other players.
A gaming machine is defined by the Gambling Act 2005 (opens in new tab) as a machine that is designed or adapted for use by individuals to gamble - whether or not it can also be used for other purposes. Most gaming machines are of the reel-based type. These are also known as fruit, slot, or jackpot machines.