You have defined legitimate casinos as only ones that don’t rig games or do scams. A priori you are correct.
There are enough illegitimate online casinos to create a problem for the whole industry.
Online casinos = scam
explain what economic incentive do legitimate casinos (licensed) to rig game
They don’t have enough users so they need to squeeze their regular punters harder.
Even your beloved “legitimate” casinos do “rig” games by offering different odds at different times to different people. They scam people by restricting the amount that can be withdrawn (and other ToS tricks). They create user interfaces to maximise player losses.