No, all legit online casinos comply with the norms of regulations laid down by the jurisdiction in which they operate. For example, if an online casino is operating from a country where gambling is legal and regulation is enforced (e.g. Malta). Failure to make this compliance will result in suspension/closure by regulators and the casino will not be able to offer their services anymore.
Online Casinos that are into fraudulent activities face arrest and imprisonment for violating gaming laws; hence we can conclude that these casino games are not rigged in any way because it’s simply not profitable enough for them to think otherwise.