Overall bot activity on the web has soared, with a 26 percent growth rate. In 2019, overall bad-bot traffic grew by 26 percent, rising to account for a quarter (24.5 percent) of total internet traffic. Attacks on applications, APIs and mobile sites are all on the rise. In e-commerce, the most common bot attack type for the travel industry is denial of inventory This is a tactic meant to restrict availability of bookable properties or airline seats for actual humans.
Source: https://threatpost.com/threatlist-bots-spike-e-commerce-and-travel/155302/