Thinking about donating sperm? Don't do it.

https://www.statnews.com/2019/09/11/consumer-dna-tests-sperm-donor-anonymity/

‘There’s no such thing as anonymity’: With consumer DNA tests, sperm banks reconsider long-held promises to donors

The rise of consumer genetic tests — which allow people to connect with relatives they never knew they had, including some who never intended to be found in the first place — is forcing sperm donation clinics to confront the fact that it is now virtually impossible to guarantee anonymity to their clients. Instead, sites like 23andMe and Ancestry.com are giving customers the genetic clues they need to identify biological parents on their own.

“Nobody could have anticipated 15 years ago that somebody could find out — because one of their cousins took a 23andMe test — that they’re the offspring of some sperm donor in, say, Seattle,” said Dr. Peter McGovern, a professor of reproductive endocrinology and infertility at Rutgers New Jersey Medical School.

Anonymity has also made it easier for clinics to find willing donors, at least in the United States. Anonymous donations are no longer legal in several countries — including Australia, New Zealand, and the United Kingdom — and in those countries there is often a dearth of willing donors, and a shortage of supply.

An interesting tidbit...

Some ethicists and others balk at the idea of donor anonymity in the first place, saying it denies progeny the opportunity to understand issues that are critical to the formation of their own identities.

This evidently does not apply to paternity fraud.