I think there are many others one could point to more accurately, including Yahoo who purchased and then resold tumblr.
While Tumblr has made a lot of changes, some of which were walked back, they are still a well used and beloved site today. There are many now-dead or barely alive behemoth Internet companies that are better examples of “poster child for running a terrible Internet business” imo.
I don’t think it’ll crash like that tbh. You’ll still find a cheap GPU, but bc it’s old not bc of a market run