I don't think OP is shilling here, otherwise he wouldn't mention the withdrawal limit issue wich resulted in him losing all his winnings.
OP is not a shilling but has been forced to lose all the winning due to withdrawal issues on the site, most of the sites that offer such big bonuses and winning always have a withdrawal limit or conditions that are hard to be met which potentially results in the total loss on the players so I will advise before you play or deposit on any site make sure to have read the withdrawal terms and conditions.
Yes, I think so too. However, imagine a whale comes to this casino who is used to gambling with amounts of several thousand dollars, and at the end he cannot withdraw his winnings from the casino all at once, but has to do so in steps of several thousand per day. The OP claims that he can withdraw only 15,000 doge per day (and max 300,000 per month) from the casino, which is simply too low for many professional gamblers.