Individual countries don't care much about that. (Well, they do, but they outsource the investigations to the local banks.) It's more a question of what the bank will say. You may be asked to show tax returns to︀ prove the money you are bringing is clean.
If you just move to another EU︁ country and start declaring your income there from the day you moved there, it's possible︂ no one will ever ask about the 200,000 you have sitting in Revolut , as︃ long as you don't give anyone a reason to ask. I.e., don't buy property right︄ away with your untaxed money, don't take out a big loan, don't draw attention, don't︅ wire any large sums from Revolut to your new bank accounts. Start from scratch and︆ only very slowly and gradually dip into the untaxed savings.
If you look like just︇ some average intra-EU migrant looking to open a simple bank account for salary payments, banks︈ will often be satisfied with just basic due diligence meaning they probably won't ask for︉ tax returns or dig deeper into the source of funds. But if you're opening a︊ business account for a new company, the banks are obligated to look into your source︋ of wealth which can include verifying that taxes have been paid.
Your situation might be︌ so bad you need to leave the EU for a while. UAE could work. If︍ you take up residence and get settled in UAE, you can then notify Revolut that︎ because you are about to relocate outside of EU, you would like to close your️ account and wire all funds to your new bank account in UAE. Stay in UAE for a number of years, build up your wealth in a clean way, and then you can go back to EU.
