Most sperm donation activities are done anonymously in the USA. Although some clinics in the USA, do have an open identification or identity release program they are under no legal obligation to do so. Many clinics do not have such a program. Anonymous donations are still the norm in the USA.
The underlying issue regarding these types of sperm donation is one of bio-ethics. Some against the position of anonymous donations argue that sperm donation to be anonymous prevents the subsequent children from having full knowledge of their medical history. These positions are often referred to as the 'right to know your genetic origin.'
The biggest issue that I can see in the banning of anonymous donors is that it will greatly reduce the amount of men willing to donate. Those willing to donate will also have to receive more money for there... 'efforts'.
There is also the issue of who or what is going to govern this database of sperm donors. What assurances to data safety are the donors going to have and who is going to be held accountable if there is a data breach?
In the countries that do give a child the right to know the sperm donor (Like the UK for instance), the right is not reciprocal, so far as the child has the right to know certain things about the donor, but the donor does not have any rights to instantiate contact with the child.
This would ostensibly also include any spouse or later children of the donor.