Ask them but I'll bet they won't give you straightforward answer. Being lawyer myself I was asked this question a dozen times by Polish residents and my answer never satisfied my clients. In my opinion trading cryptos and exchanging one crypto into another creates a tax debt. This is classical tax liability arising from the exchange itself. Profit︀ is created not only when you move your assets into cash but also when you︁ trade one asset for different asset. Same thing is with crypto. That is why this︂ is problematic thing here and Imho you have already been outlaw for some time, unless︃ of course you only bought one crypto and waited patiently for its value to grow.︄ Then of course, no trade, no profit. But any trade, exchange etc. creates profit.
That is why they advised you to allocate your profits into offshore. That is good idea,︅ unless you provided your real data to some exchange provider... then, well... it gets complicated︆ but can be somehow resolved. My advice is to buy aged company.
As a natural person you have many more options, considering your citizenship. Not only︉ private banking but also many classical banks will meet you with open hands. Try Georgia,︊ fly to Tiblisi or Kuitasi and go to the nearest bank. Not only they will︋ make it quick but you will discover that they love Polish people
In case you︌ need to bank within SEPA as an individual I think you should try Latvia, Liechtenstein︍ or Luxemburg, maybe Switzerland for private banking. When you become Maltese resident you may also︎ consider Polish banks - like Getin Noble - they offer private banking as well.
