It’s dumb numerology shit. Obviously Nazis can’t go around saying “Heil Hitler” since they will immediately be clocked as a Nazi, and H.H. is pretty obvious what they are alluding to. So they post “88” since H is the 8th letter of the alphabet. You’ll often see it coupled with “14” which represents the 14 words “We must secure the existence of our people and a future for white children”
It’s also why they think that everything is a bad code that they can descramble. They have these super obvious codes to signal to others and assume every other group has a code that’s just as poorly disguised. That’s how we ended up with shit like Pizzagate. If you order certain pizzas that unlocks the secret basement with the kids! It’s also why a lot of them think there’s a super secret cabal running everything.
Nah pizzagate has an even stupider but simpler explanation. Qanon folk thought that pedophiles were using the term Cheese Pizza or CP as a code for Child Prono.
Never got around to it, but I wanted to do a statistical search of Reddit usernames that pop up in subreddits with two or more numbers at the end. You’ll of course have lots of people with '86 or '92 because they had their birth year at the end of their username. I’m betting '88 sticks out on the bar chart. Not everyone with an '88 at the end will be a nazi, but a disproportionate number with '88 would be a hint towards what kind of people the subreddit is attracting.
you also would have to normalise over all the usernames of the platform. as a number repeating itself, i would assume that it generally attracts more attention. source: i compete in team sports. after the birthyears repeating numbers are the ones most often chosen for jersey numbers.