Even big casinos will certainly have complaints and scam accusations but it will not reduce how trustworthy they depend on how they handle each complaint and for scam accusations will not be meaningful if those who do it not have strong evidence and simply just ignore it.
Every time there is a complaint, of course, there must be evidence then the casino team will take this more seriously and the casino will definitely solve it if it is a definite complaint but now there are many accusations without evidence that just want to destroy the casino, of course, it must be ignored because for me big casinos will definitely provide the best service in terms of the support it provides.
Since I gamble more often on this forum no problem except asking for help on LiveChat or other support all problems are resolved quickly.