Ah, the carefree days of the early internet...
@Zippy´s Sausage Factory: "someone losing their domain once because someone complained..."
Not quite the same thing as losing a domain, but in the relatively early days of public Internet and spam (think ~25 years ago when a lot fewer than 100% of members of the public had non-uni accounts and hardly anyone owned a domain) I started getting emails from an MP (not in the UK) who urged me to vote in a particular way in a municipal election. I didn't even live in the city in question and wasn't eligible to vote there. I sent an email to abuse@<ISP> (the ISP was easy to figure out from the personal email address the MP used), and to my surprise I got a thank-you note from the ISP the next day saying the MP's account had been deactivated due to my complaint.
In those days spam was starting to be a problem and ISPs were quite concerned about being blamed for allowing spammers to operate. Hence the swift reaction.
The recollection still gives me a warm and fuzzy feeling after all these years. Not because I didn't like the MP's politics, but because a spammer was neutralized (and, in this case, hopefully learned his lesson).
Spam from LinkedIn is much harder to get rid of. You'd be complaining to an interested party...