I'm not sure they actually _had_ a critical problem, or at least didn't before the blockchain thing; it's just that it was a pretty limited market. AIUI they _were_ profitable, but they were never going to be a multi-billion dollar company. The blockchain thing did damage their reputation quite badly, while simultaneously showing that they weren't essential (big important creators were able to use something else.)

(It's _really_ weird that they gave up on attempting to compete with Patreon in a likely larger market, tho.)