That's a good idea but most of the trusted casinos out there provide really less returns like 1-3% a year as far as I have heard. It may be more but unfortunately it is still less than the return bitcoin provides you every year.
So I would recommend you to not invest in any caaino and let the bitcoin stay in your wallet.
what do you mean casino site only get return 1-3%/year
all online investment include gambling site or casino site is return is big, if gambling site or casino site return is proportional from gambling site profit
another gambling site minimum 10%/monthly, in cloud mining majority BEP over 1 year, or equal over 5%/month
so if you write only 1-3%/year is very low profit, nothing people interest and join to invest