Actually his bankruptcy's hurt American banks. His legal games cost them money, and one by one they shut their doors to him.
Bank had propped up Trump Organization for years despite being sued by president but acted after Capitol attack
www.theguardian.com
Deutsche Bank has been Trump’s most important lender. The Trump Organization, fronted by his two older sons, owes the bank about $340m in outstanding loans. After a series of bankruptcies in the 1990s, it was the only bank willing to give Trump money.
In 2008, Trump sued the bank’s real estate division after he defaulted on a $40m repayment, used to fund the construction of the Trump International Hotel and Tower in Chicago.