I can answer a few of these the reason you see the old theme is because most of internets consisted of weebs ranging from early to late 20's.
internets started off as a containment group for trolls that came from different anime forums, and imageboards, around 2013 internets was cleaned up and legitimized purging a ton of the toxic trolls we used to have.
Internets is an old term used on the internet in the early 2000's broken english was pretty popular to ironicly use back then. Most of our conversation were pretty much old farts missing the old times, we eventually came to 8ch in hopes of finding likeminded anons.
We never had a topic or goal, we use old memes because its pretty much what is left of what we used to know the internet as, -and we thought it was going to shit in 2013- we could not imagine it would get this bad in 2017.
And here we are now, learning that as much as it is nice to look back at the old days, that the internet is evolving and the past is being buried and forgotten. its sad but we eventually will need to adapt with the times or slowly die like we have been.