Hi, @drwiener . Welcome to Lines!
Alternative answers to your question include “any running a default-configuration of Discourse where users haven’t altered their settings”, amongst others, some of which have already been supplied.
One person’s “invasive” is another person’s “useful reminder for communities and sites they visit less often”. I’m sorry that an email riled you quite so much, and inspired your very first topic. Once you’ve altered your settings, I’m sure you’ll find that things are pretty chill around these parts.