It's also great when other people do this - because it's a dead canary when you start seeing people's emails with +website being collected and shared. I remember like 6 years ago when someone compiled and publicly shared a list of emails&passwords. By simply grep'ing the +websitename out of the email I found that there were easily 800+ unique websites that leaked their login emails and passwords after some validation. I made a comment on reddit about it and some articles that cited it got millions of hits, but people have seemingly forgot since then that finding [email protected] being shared in lists is a good canary in the coal mine for hacked websites.