A bank is owned by individual shareholders. It hires individuals to run its operations. It must make such offers attractive to keep customers away from competitors. A bank's shareholders are interested in maximizing the return on their investment. Competitors want its customers.
Some employees prefer to work for big banks with international operations.
Observe that these interests vary and even clash. To hell with shareholders' rights. Under capitalism the government's job is to protect the legitimate and equal rights of each and every member of the public, including shareholders. To conceive of one's interests as requiring the violation of other people's rights is irrational. First, it invites others to violate one's own rights.