United Kingdom: 175\n\n The UK Gambling Commission regulates the country's gambling industry, issuing 3,368 licenses to 2,439 online gambling companies. There are currently over 175 online casinos operating domestically.
Since they're licensed and prominently display a seal from state gambling regulators to prove it, BetMGM, Caesars Palace, DraftKings, Golden Nugget and Borgata are among the most trusted online casinos.