Casino Scam is common with new sites. That is why whenever a site share the bonus or any other offer, everyone should gain good knowledge about that site before restoration or opposite. Until good information about that site is available, there should not be deposit. Moreover, I agree with you in any such case, one should definitely deposit a small amount of deposit first time, if that site get scammed you will loss all the assets so the maximum caution should be taken in this case.
Indeed newly created casinos have more tendency to scam their player since the casino has yet to establish any reputation and the site might be created as scamming of phishing their player of its important information. So we should be vigilant and reserved when playing in a newly created casino. There are lots of cases where the player is unable to withdraw their winnings in a newly created casino and ends up being scammed since they never get to withdraw their winnings until the casino shutdown.
That's a very unlikely situation you described at the end, scam platforms barely shut down but they keep looking for more targets once they scam those who have been trapped by them, and the circle continues until the whole community knows about them and then people stop using the platform, and even after that, the developers come back with a different theme, a different website and start doing the same thing again.
This also used to happen back in the days of Bitcoin Doubler scams where once a website is abandoned by users since it wasn't paying, the developers used to create another website with another name and a theme and start their business again.