Had the same issue sa BDO few months ago. I tried opening an account sa kanila (davao branch) at ganun din yung tanong; saan daw galing yung pera ko dahil kapag may connection daw sa bitcoin, pupwede daw nila e close yung account. 'Di ko na tinuloy yung balak ko sa BDO, dun nalang ako sa BPI, but they asked the same question. So, I lied para 'lang makapag-bukas ako ng account.   No point on being honest with these guys kung anytime pupwede nila e-close yung account mo just because connected ito with cryptocurrencies.