Many (if not most) contribute to FOSS projects under their real names, and often have their email addresses (even if maybe project specific), so they can bother

Many (if not most) contribute to FOSS projects under their real names, and often have their email addresses (even if maybe project specific), so they can bother you off list in various ways. This happens in FOSS projects even to this day. There's this one dude who is banned from a popular linux distro mailing list, so he reads the public archives and emails the people he has disagreements with to yell at them. Nobody who signed up for that list expected to be yelled at by some asshole. Others have followed maintainers of projects to other projects to yell at them and spread lies about them to others.