Online they are much more likely to withhold your funds for some excuse like "KYC/AML needs further review and more docs." In that sense, quite a few of them are rigged, especially if you have a big win. The games themselves are probably honest and "fair" they don't need to cheat there to win your money.
Even though there is a requirement for KYC/AML online, online gambling is still very popular nowadays because physically gambling offline on the roadside or in open spaces can be very troublesome for a respectable person and can be a loss of respect. For example, I can never gamble in front of people in my area because I am a humble and polite guy to the people of my area. If I gamble, people will comment badly on me, that is why I always prefer online gambling. There are many such people who can do the same and they will prefer online gambling. So, no matter how convenient offline gambling is, it is not at all preferable for me.