No casino site is completely trustworthy. Each site operates its own business. And the marketing strategies of different sites are different, the more gamblers the site can attract and the more users the site has, the more hype there is about the site. For example, this forum has some sites that have been promoted for a long time like Stake, Rollbit, sportsbet, Duelbits due to which these sites are now considered very trustworthy and many users of this forum freely gamble on these sites. I myself gamble at Rollbit & Stake. so how trustworthy a site is depends on everyone's experience and satisfaction which varies from person to person.
Well, I don't agree with you my friend. Whether a site is trustworthy or not does not depend on individual experiences, it depends on how it manages its business. And in the case of the ones you mention, like Duelbits or Rollbit (as well as others) they are very well managed, that's why they have so many customers and have lasted so many years.
But the untrustworthy ones end up scamming their customers, or at least playing dirty tricks, like letting them bet from a country that is forbidden in their ToS and only when the user wins and is going to withdraw the money they ask for a KYC to deny the withdrawal because they have broken the ToS.