Assignment of claims - Do all banks do this? Can it be changed?

I would like to say this: When you know each other well, something can happen. We are at a Volksbank and wanted to exclude any kind of credit securitization and transfer of our loan to third parties. That was done, the interest rate rose from 1.25 to 1.29 percent. I found that acceptable. I see securitizations very critically. The house and farm notary well known to us made us aware of a Frankfurt case where a builder of a rental apartment complex financed it through a major bank. The loan was resold. It was fully repaid. Only the borrower failed to have the deletion carried out. Despite the existing deletion approval, the purchaser of the loan, a US financial investor, went to the land register and wanted to seize and realize the rental building. It took a strenuous process to fend off this intention and the case has become a topic of conversation among lawyers. Karsten