Regarding Open Finance, from what I have heard they push pretty much all foreign applicants in the direction of Noble Bank, to whom they are affiliated (same ownership I think). Noble Bank do not have very competitive interest rates and their fees/commissions are also high.
My business, Poland Mortgage Direct, uses some of the major banks - BZWBK, Deutsche, Millennium, Fortis to name a few - these mortgage offers, should the applicant qualify, are very competitive and the same as what a Polish applicant should get (though LTV max is usually 80-90% for foreigners).
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property-krakow.com
poland-mortgage-direct.com
krakow-apartmentz.biz