Imagine Reddit does this next lmao one day you open up and all your real life social media are linked to your u/Lick_My_Fuckhole profile, your coworkers see you as "people you may know" on their profiles. Neat
Facebook did it as well, maybe a couple years after opening up to the non university crowd. Neither FB at the time or G+ years later gave any thought that their no pseudonym policies put someone's safety at risk.