They're closely monitoring money coming into them as it might be triggered for AMLA.
As long as you stay below the minimum to trigger the authorities, you should be fine. If you are constantly gambling and say you are winning, then you might consider using different banks so you'll be able to spread your deposits and they'll not gonna notice your big wins. I understand about the bank secrecy law, I think most banks have that in place to them to protect the asset of their clients, but as we all know, banks are regulated by the government, so they can ask information that will be useful for their investigation.
If they have information as to where the source of funds is coming and there is a violation on your end for not remitting the appropriate tax, so that might trigger, but you know in the Philippines it's not so strict, what they do is they priorities those bigger funds that are coming so they could get bigger taxes, unless you are being suspected of money laundering which is completely a different thing and a more serious one since it will soon be a criminal act once proven.