It gets into the meme rotation because it gets reposted somewhere and got a lot of views, then it gets reposted a lot by human and bot alike. One big post can cause this to happen.

Literally the only time I ever use reddit is if it is a google result(stopped after 3rd party ban).

Someone called it wistful when I looked it up and I like the word (read it here: https://english.stackexchange.com/questions/50144/is-there-a-term-that-defines-nostalgia-for-something-youve-never-experienced#50147 ) it’s nostalgia without needing to have lived it. So nostalgia is wistful but wistful also covers things you haven’t lived.