Tumblr is kinda back imo. But the main reason for it’s death was also that the company that bought tumblr back then thought it would be the new PDF…yes you heard me right… https://qz.com/708295/yahoos-grand-plan-for-tumblr-was-to-turn-it-into-the-next-generation-pdf
yeah it does make zero sense, shows that they neither understood PDFs nor Tumblr