You say that but I've seen a few cases similar to this one where you confiscate deposits using your duplicate account rule, like this one (as an example): askgamblers.com/casino-complaints/royal-panda-casino-responsible-gambling-issue
Do you not think you should be picking up Self Excluded customers earlier, as you seem to be able to find duplicate accounts a lot easier, funnily enough as the duplicate account means you get to keep the money (however dodgy that term is)?
There are a number of groups with whom bypassing SE seems to be very easy whilst others obviously apply more stringent tests. You see it regularly with the same operators names coming up.