Used my coins.ph wallet address several times already in gambling-related transactions, even back when Directbet was still active, but still no problem.

As long as the amount involved isn't alarming, you will be fine.

Remember Bustabit guys? I have several known persons who gambled there in the past and got lucky (or I don't know what trick they did but they earned big and I saw it). Their big winnings were cashed-out almost regularly until coins.ph noticed that activity. I even saw withdrawing BTC0.05-BTC0.1 every 2 to 3 days. That was really alarming so coins.ph asked for some details and those users say it came from "gambling" then you know what happened next, account frozen. I don't remember what happened next from there.