that the casino flagged their account
What happens when someone wins consecutively from a casino? You already answered the question

I believe that most of the casino would flagged their account or at least they will keep an eye that user. Because consecutively is impossible, maybe win streak one or two times is possible but if you win like 100 times in a row I would say casino would watch you.
They might freeze your account and asked some question but I don't believe people always hit jackpot in game like Slot machine or lottery but in the card game the possibility is high
I believe that it isnt hard to win 100 times in a row in a game like crash if you play it with 1.01 odd cashout. I it might take several tries, but chances of 100 straight wins are high. I would have huge doubts that people will use large funds to try it, but it aint costly to try it to achieve that with 1 sat bet. Do you still think that casino might give special attention or freeze someones account, if he wins less than 1 sat by the end ?