Who is harmed by a „Real Names“ policy? - Geek Feminism Wiki
The cost to these people can be vast, including:
harassment, both online and offline
discrimination in employment, provision of services, etc.
actual physical danger of bullying, hate crime, etc.
arrest, imprisonment, or execution in some jurisdictions
economic harm such as job loss, loss of professional reputation, etc.
social costs of not being able to interact with friends and colleagues
possible (temporary) loss of access to their data if their account is suspended or terminated
The groups of people who use pseudonyms, or want to use #pseudonyms, are not a small minority