A settlement is negotiated and both sides agree. Any corporation signing up for a settlement does so knowingly and with an army of expensive lawyers advising them. This is unnecessary interference in the process. Also, it is not always possible to compensate all the victims as individuals. So for example, if a company is settling a suit for discrimination against the disabled, it might make sense for them to donate to a charity for that disabled rather than tracking down every victim who may not be known.