Just because there are no complaints about blocked withdrawals or account suspensions doesn't guarantee that such situations won't arise. This casino is still relatively new. Two months is still too short a period to build good trust.
But regarding your situation with a $3,000 withdrawal being delayed by several hours, I wouldn't overreact. Manual checks are very common for first-time withdrawals over $1,000 for new players, and sometimes completely normal. So I wouldn't consider your situation even a minor red flag.
Maybe, this is first time to use a new casino that uses manual withdrawal on big amount of money because they must take their time to verify and process everything to make sure that there is nothing fishy with your win.
No, this isn't the first time I've encountered a situation like this. That's exactly what I wrote, that these kinds of situations happen very often and it's not a problem, just routine casino security.
I believe with time, the casino will improve and serve their customers better. If it was me, I wouldn't bother since my withdrawal was finally made. I see no red flag in his experience.
Every project related to money tries to be as careful as possible at the beginning, so it is no wonder that casinos also care about security.
Of course, there are no red flags here. They might appear if the delay were a few days. But I believe that over time, cryptocurrency withdrawals will become instant. The best casinos represent precisely this level.